US20090021352A1 - Radio frequency ic device and electronic apparatus - Google Patents
Radio frequency ic device and electronic apparatus Download PDFInfo
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- US20090021352A1 US20090021352A1 US12/235,753 US23575308A US2009021352A1 US 20090021352 A1 US20090021352 A1 US 20090021352A1 US 23575308 A US23575308 A US 23575308A US 2009021352 A1 US2009021352 A1 US 2009021352A1
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- radio frequency
- electrode
- circuit board
- loop
- chip
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
- G06K19/0775—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card arrangements for connecting the integrated circuit to the antenna
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
- H01Q1/2225—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0237—High frequency adaptations
- H05K1/0239—Signal transmission by AC coupling
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0237—High frequency adaptations
- H05K1/0243—Printed circuits associated with mounted high frequency components
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/14—Structural association of two or more printed circuits
- H05K1/141—One or more single auxiliary printed circuits mounted on a main printed circuit, e.g. modules, adapters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/10—Bump connectors; Manufacturing methods related thereto
- H01L2224/15—Structure, shape, material or disposition of the bump connectors after the connecting process
- H01L2224/16—Structure, shape, material or disposition of the bump connectors after the connecting process of an individual bump connector
- H01L2224/161—Disposition
- H01L2224/16151—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/16221—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/16225—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/10—Bump connectors; Manufacturing methods related thereto
- H01L2224/15—Structure, shape, material or disposition of the bump connectors after the connecting process
- H01L2224/16—Structure, shape, material or disposition of the bump connectors after the connecting process of an individual bump connector
- H01L2224/161—Disposition
- H01L2224/16151—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/16221—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/16225—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
- H01L2224/16227—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation the bump connector connecting to a bond pad of the item
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
- H04Q2213/13095—PIN / Access code, authentication
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/16—Printed circuits incorporating printed electric components, e.g. printed resistor, capacitor, inductor
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10007—Types of components
- H05K2201/10098—Components for radio transmission, e.g. radio frequency identification [RFID] tag, printed or non-printed antennas
Definitions
- the present invention relates to radio frequency IC devices, and, more particularly, to a radio frequency IC device including a radio frequency IC chip used in an RFID (Radio Frequency Identification) system and an electronic apparatus including the radio frequency IC device.
- RFID Radio Frequency Identification
- an RFID system has been developed as a product management system in which a reader/writer arranged to generate an induction field communicates with an IC chip (hereinafter also referred to as an IC tag or a radio frequency IC chip) attached to a product or a case in a non-contact manner so as to obtain predetermined information stored in the IC chip.
- an IC chip hereinafter also referred to as an IC tag or a radio frequency IC chip
- Japanese Unexamined Patent Application Publication (Translation of PCT Application) No. 11-515094 discloses an RFID tag including an IC chip mounted on the main surface of a printed circuit board and an antenna provided in the printed circuit board.
- the antenna and the IC chip are electrically connected to each other.
- the miniaturization of the RFID tag is achieved by providing the antenna in the printed circuit board.
- the number of manufacturing processes required to produce the RFID tag is increased in order to prepare the dedicated antenna, and a space is required for the dedicated antenna. This leads to increases in the manufacturing cost and size of the RFID tag.
- FIG. 2 in Japanese Unexamined Patent Application Publication (Translation of PCT Application) No. 11-515094, the number of manufacturing processes is increased especially if an antenna having a meander shape is formed, since internal electrodes included in a plurality of layers must be processed.
- a matching section is required. If the matching section is disposed between the antenna and the IC chip, the size of the antenna is increased. Furthermore, if the IC chip is modified, the shape of the antenna must be changed.
- preferred embodiments of the present invention provide a small radio frequency IC device capable of easily achieving impedance matching without using a dedicated antenna and an electronic apparatus including the radio frequency IC device.
- a radio frequency IC device includes a radio frequency IC chip arranged to process a transmitted/received signal, a circuit board on which the radio frequency IC chip is mounted, an electrode arranged on the circuit board, and a loop electrode that is arranged on the circuit board so that the loop electrode is coupled to the radio frequency IC chip and the electrode.
- a radio frequency IC device includes an electromagnetic coupling module including a radio frequency IC chip arranged to process a transmitted/received signal and a power supply circuit board that includes an inductance element coupled to the radio frequency IC chip, a circuit board on which the electromagnetic coupling module is mounted, an electrode arranged on the circuit board, and a loop electrode that is arranged on the circuit board so that the loop electrode is coupled to the power supply circuit board and the electrode.
- a radio frequency IC chip or a power supply circuit board is preferably coupled to an electrode arranged at a circuit board, for example, a ground electrode via a loop electrode.
- the electrode arranged on the circuit board functions as a radiation plate (an antenna) for the radio frequency IC chip. That is, the electrode receives a signal, and the radio frequency IC chip receives the signal from the electrode via the loop electrode and is operated by the received signal.
- a response signal output from the radio frequency IC chip is transmitted to the electrode via the loop electrode, and is then emitted from the electrode to the outside. Accordingly, a dedicated antenna is not required, and a space is not required for the dedicated antenna.
- the loop electrode can perform the impedance matching between the radio frequency IC chip and the electrode. Accordingly, a matching section is not necessarily required. Therefore, the efficiency of signal transmission between the radio frequency IC chip and the electrode is improved.
- a power supply circuit board is disposed between a radio frequency IC, for example, a radio frequency IC chip and a loop electrode.
- This power supply circuit board includes a resonance circuit including an inductance element and/or a matching circuit.
- a frequency to be used is set by the resonance circuit and/or the matching circuit. If the radio frequency IC chip is changed in accordance with a frequency used by an RFID system, only a change in design of the resonance circuit and/or the matching circuit is required. It is not necessary to change the shape, size, and/or location of a radiation plate (electrode) or the state of coupling between the loop electrode and the electrode or the power supply circuit board.
- the resonance circuit and/or the matching circuit can also function to achieve the impedance matching between the radio frequency IC chip and the electrode. Accordingly, the efficiency of signal transmission between the radio frequency IC chip and the electrode is improved.
- the loop electrode is preferably coupled to the radio frequency IC chip or the power supply circuit board may preferably include a plurality of layers included in a multilayer circuit board.
- the radio frequency IC chip stores various pieces of information about a product to which the radio frequency IC device is attached, and, furthermore, may be a re-writable radio frequency IC chip. That is, the radio frequency IC chip may have an information processing function in addition to an RFID system function.
- an existing electrode included in a circuit board can preferably be used as an antenna. Since a dedicated antenna is not required, a radio frequency IC device and an apparatus including the radio frequency IC device can be miniaturized.
- a resonance circuit and/or a matching circuit included in a loop electrode and/or a power supply circuit board may have an impedance matching function. Accordingly, a matching section is not necessarily required.
- FIG. 1A is a plan view of a radio frequency IC device according to a first preferred embodiment of the present invention.
- FIG. 1B is a cross-sectional view in a lengthwise direction of the radio frequency IC device according to the first preferred embodiment of the present invention.
- FIG. 2 is a perspective view of a radio frequency IC chip.
- FIG. 3A is a plan view of a radio frequency IC device according to a second preferred embodiment of the present invention.
- FIG. 3B is a cross-sectional view in a lengthwise direction of the radio frequency IC device according to the second preferred embodiment of the present invention.
- FIG. 4A is a plan view of a radio frequency IC device according to a third preferred embodiment of the present invention.
- FIG. 4B is a cross-sectional view in a lengthwise direction of the radio frequency IC device according to the third preferred embodiment of the present invention.
- FIG. 4C is a cross-sectional view in a widthwise direction of the radio frequency IC device according to the third preferred embodiment of the present invention.
- FIG. 5A is a plan view of a radio frequency IC device according to a fourth preferred embodiment of the present invention.
- FIG. 5B is a cross-sectional view in a lengthwise direction of the radio frequency IC device according to the fourth preferred embodiment of the present invention.
- FIG. 6A is a plan view of a radio frequency IC device according to a fifth preferred embodiment of the present invention.
- FIG. 6B is a cross-sectional view in a lengthwise direction of the radio frequency IC device according to the fifth preferred embodiment of the present invention.
- FIG. 6C is a cross-sectional view in a widthwise direction of the radio frequency IC device according to the fifth preferred embodiment of the present invention.
- FIG. 7A is a plan view of a radio frequency IC device according to a sixth preferred embodiment of the present invention.
- FIG. 7B is a cross-sectional view in a lengthwise direction of the radio frequency IC device according to the sixth preferred embodiment of the present invention.
- FIG. 8A is a plan view of a radio frequency IC device according to a seventh preferred embodiment of the present invention.
- FIG. 8B is a cross-sectional view in a lengthwise direction of the radio frequency IC device according to the seventh preferred embodiment of the present invention.
- FIG. 9 is an exploded plan view of a circuit board of a radio frequency IC device according to an eighth preferred embodiment of the present invention.
- FIG. 10 is an exploded plan view of a circuit board of a radio frequency IC device according to a ninth preferred embodiment of the present invention.
- FIG. 11 is a plan view of a circuit board of a radio frequency IC device according to a tenth preferred embodiment of the present invention.
- FIG. 12 is a plan view illustrating a main portion of a circuit board of a radio frequency IC device according to an eleventh preferred embodiment of the present invention.
- FIG. 13 is an exploded plan view of a circuit board of a radio frequency IC device according to a twelfth preferred embodiment of the present invention.
- FIG. 14 is an exploded plan view of a circuit board of a radio frequency IC device according to a thirteenth preferred embodiment of the present invention.
- FIG. 15 is an exploded perspective view of a power supply circuit board including a first exemplary resonance circuit.
- FIG. 16 is a plan view of a power supply circuit board including a second exemplary resonance circuit.
- FIG. 17 is a perspective view of a mobile telephone that is an electronic apparatus according to a preferred embodiment of the present invention.
- FIG. 18 is a diagram describing a printed circuit board included in the mobile telephone.
- FIGS. 1A and 1B are diagrams illustrating a radio frequency IC device according to the first preferred embodiment of the present invention.
- This radio frequency IC device includes a radio frequency IC chip 5 arranged to process a transmitted/received signal of a predetermined frequency, a printed circuit board 20 on which the radio frequency IC chip 5 is mounted, and a ground electrode 21 and a loop electrode 22 which are arranged on the printed circuit board 20 .
- Each of the ground electrode 21 and the loop electrode 22 is formed on the main surface of the printed circuit board 20 preferably by applying coating of conductive paste thereto or by etching metal foil on the printed circuit board 20 .
- the radio frequency IC chip 5 includes a clock circuit, a logic circuit, and a memory circuit, and stores necessary information. As illustrated in FIG. 2 , input-output terminal electrodes 6 and mounting terminal electrodes 7 are provided on the undersurface of the radio frequency IC chip 5 . One of the input-output terminal electrodes 6 is electrically connected to a connection electrode 22 a disposed at one end of the loop electrode 22 via a metal bump 8 , and the other one of the input-output terminal electrodes 6 is electrically connected to a connection electrode 22 b disposed at the other end of the loop electrode 22 via the metal bump 8 . A pair of connection electrodes 22 c and 22 d is disposed on the printed circuit board 20 . One of the mounting terminal electrodes 7 of the radio frequency IC chip 5 is connected to the connection electrode 22 c via the metal bump 8 , and the other one of the mounting terminal electrodes 7 is connected to the connection electrode 22 d via the metal bump 8 .
- the loop electrode 22 is arranged near the edge of the ground electrode 21 in the horizontal direction, whereby the loop electrode 22 and the ground electrode 21 are coupled to each other by electric field coupling. That is, by arranging the loop electrode 22 near the ground electrode on the same surface, a loop magnetic field H (denoted by a dotted line in FIG. 1A ) is generated from the loop electrode 22 in the vertical direction. The generated loop magnetic field H enters the ground electrode 21 substantially at right angles, so that a loop electric field E (denoted by an alternate long and short dashed line in FIG. 1A ) is excited. The loop electric field E induces another loop magnetic field H.
- the loop electric field E and the loop magnetic field H are generated on the entire surface of the ground electrode 21 , so that a high-frequency signal is emitted.
- the ground electrode 21 and the loop electrode 22 close to each other on the same main surface while providing the electrical isolation between them, the electromagnetic field coupling therebetween is effectively achieved. Consequently, a radiation characteristic is improved.
- the electromagnetic coupling between the loop electrode 22 and the ground electrode 21 enables a high-frequency signal received by the ground electrode 21 from a reader/writer to be transmitted to the radio frequency IC chip 5 via the loop electrode 22 so as to activate the radio frequency IC chip 5 , and enables a response signal output from the radio frequency IC chip 5 to be transmitted to the ground electrode 21 via the loop electrode 22 and then be emitted from the ground electrode 21 toward the reader-writer.
- the ground electrode 21 may preferably be defined by an existing component included in the printed circuit board 20 of an electronic apparatus containing the radio frequency IC device.
- a ground electrode used for another electronic component included in an electronic apparatus may be used as the ground electrode 21 , for example. Accordingly, in this radio frequency IC device, a dedicated antenna is not required, and a space is not required for the antenna. Furthermore, since a large ground electrode 21 is used, a radiation characteristic is improved.
- the impedance matching between the radio frequency IC chip 5 and the ground electrode 21 can be achieved.
- FIGS. 3A and 3B are diagrams illustrating a radio frequency IC device according to the second preferred embodiment of the present invention.
- This radio frequency IC device is substantially the same as a radio frequency IC device according to the first preferred embodiment.
- the ground electrode 21 and the loop electrode 22 are disposed on the bottom surface of the printed circuit board 20 .
- Connection electrodes 24 a to 24 d are provided on the surface of the printed circuit board 20 .
- the connection electrodes 24 a and 24 b are electrically connected through a via-hole conductor 23 to one end of the loop electrode 22 and the other end of the loop electrode 22 , respectively.
- the connection electrodes 24 a to 24 d correspond to the connection electrodes 22 a to 22 d illustrated in FIGS. 1A and 1B .
- One of the input-output terminal electrodes 6 is preferably electrically connected to the connection electrode 24 a via the metal bump 8 , for example, and the other one of the input-output terminal electrodes 6 is preferably electrically connected to the connection electrode 24 b via the metal bump 8 , for example.
- One of the mounting terminal electrodes 7 is preferably connected to the connection electrode 24 c via the metal bump 8 , for example, and the other one of the mounting terminal electrodes 7 is preferably connected to the connection electrode 24 d via the metal bump 8 , for example.
- the ground electrode 21 and the loop electrode 22 are coupled in substantially the same manner as that described in the first preferred embodiment.
- the operational advantages of a radio frequency IC device according to the second preferred embodiment are substantially the same as those of a radio frequency IC device according to the first preferred embodiment.
- a large space for another electronic component can be obtained on the upper surface of the circuit board 20 .
- FIGS. 4A to 4C are diagrams illustrating a radio frequency IC device according to the third preferred embodiment of the present invention.
- a loop electrode 25 includes connection electrodes 25 a and 25 b disposed on the surface of the printed circuit board 20 , via-hole conductors 28 , and an internal electrode 29 .
- the loop electrode 25 is coupled to the ground electrode 21 disposed on the bottom surface of the printed circuit board 20 by electric field coupling.
- the connection electrodes 25 a and 25 b are preferably electrically connected via the metal bump 8 to the terminal electrodes 6 (see, FIG. 2 ).
- Connection electrodes 25 c and 25 d are electrically connected via the metal bump 8 to the terminal electrodes 7 (see, FIG. 2 ).
- the loop electrode 25 is arranged near the ground electrode 21 in the vertical direction, and is coupled to the ground electrode 21 by electric field coupling. That is, a magnetic flux is generated from the loop electrode 25 near the surface on which the ground electrode 21 is arranged, and an electric field that intersects the magnetic field substantially at right angles is generated from the ground electrode 21 . As a result, an electric field loop is excited on the ground electrode 21 . The excited electric field loop generates a magnetic field loop. Thus, the electric field loop and the magnetic field loop are generated on substantially the entire surface of the ground electrode 21 , such that a high-frequency signal is emitted. That is, by arranging the loop electrode 25 near the ground electrode 21 in the vertical direction while providing the electric isolation between the loop electrode 25 and the ground electrode 21 , the flexibility in the placement of the loop electrode 25 can be increased.
- a radio frequency IC device is substantially the same as those of a radio frequency IC device according to the first preferred embodiment.
- the loop electrode 25 is disposed in the printed circuit board 20 , interference caused by the penetration of a magnetic field from the outside can be prevented.
- the ground electrode 21 may be formed in the printed circuit board 20 .
- another line or another electronic component may be disposed thereon so as to increase the packing density.
- FIGS. 5A and 5B are diagrams illustrating a radio frequency IC device according to the fourth preferred embodiment of the present invention.
- This radio frequency IC device includes a loop electrode 31 obtained by providing a cutout 21 a at one side of the ground electrode 21 disposed on the surface of the printed circuit board 20 .
- Connection electrodes 31 a and 31 b are electrically connected via the metal bump 8 to one of the input-output terminal electrodes 6 (see, FIG. 2 ) and the other one of the input-output terminal electrodes 6 , respectively.
- Connection electrodes 31 c and 31 d provided on the surface of the printed circuit board 20 are electrically connected via the metal bump 8 to the mounting terminal electrodes 7 (see, FIG. 2 ) of the radio frequency IC chip 5 .
- the loop electrode 31 is electrically coupled to the ground electrode 21 .
- the radio frequency IC chip 5 is coupled to the ground electrode 21 via the loop electrode 31 arranged therebetween.
- the operation and operational advantages of a radio frequency IC device according to the fourth preferred embodiment are substantially the same as those of a radio frequency IC device according to the first preferred embodiment.
- FIGS. 6A to 6C are diagrams illustrating a radio frequency IC device according to the fifth preferred embodiment of the present invention. Similar to a radio frequency IC device according to the fourth preferred embodiment, in this radio frequency IC device, the ground electrode 21 is electrically coupled to a loop electrode 32 . More specifically, the loop electrode 32 includes connection electrodes 33 a and 33 b disposed on the surface of the printed circuit board 20 and via-hole conductors 34 . The ground electrode 21 is disposed on the bottom surface of the printed circuit board 20 . The upper end of one of the via-hole conductors 34 is electrically connected to the connection electrode 33 a , and the upper end of the other one of the via-hole conductors 34 is electrically connected to the connection electrode 33 b .
- connection electrodes 33 a and 33 b are electrically connected via the metal bump 8 to the terminal electrodes 6 (see, FIG. 2 ) of the radio frequency IC chip 5 .
- Connection electrodes 33 c and 33 d are electrically connected via the metal bump 8 to the terminal electrodes 7 (see, FIG. 2 ) of the radio frequency IC chip 5 .
- the loop electrode 32 is electrically coupled to the ground electrode 21 .
- the radio frequency IC chip 5 and the ground electrode 21 are coupled to each other via the loop electrode 32 disposed therebetween.
- the operation and operational advantages of a radio frequency IC device according to the fifth preferred embodiment are substantially the same as those of a radio frequency IC device according to the first preferred embodiment.
- FIGS. 7A and 7B are diagrams illustrating a radio frequency IC device according to the sixth preferred embodiment of the present invention.
- an electromagnetic coupling module 1 is provided by mounting the radio frequency IC chip 5 on a power supply circuit board 10 .
- the electromagnetic coupling module 1 is electrically connected to a loop electrode 35 provided on the printed circuit board 20 .
- the loop electrode 35 is arranged near the ground electrode 21 provided on the surface of the printed circuit board 20 , whereby the loop electrode 35 and the ground electrode 21 are coupled to each other by magnetic field coupling.
- One of the input-output terminal electrodes 6 of the radio frequency IC chip 5 which are illustrated in FIG. 2 , and the other one of the input-output terminal electrodes 6 are electrically connected via the metal bump 8 to electrodes 12 a and 12 b (see, FIGS. 15 and 16 ) provided on the surface of the power supply circuit board 10 .
- One of the mounting terminal electrodes 7 of the radio frequency IC chip 5 and the other one of the mounting terminal electrodes 7 are electrically connected via the metal bump 8 to electrodes 12 c and 12 d .
- a protection film 9 is disposed between the surface of the power supply circuit board 10 and the bottom surface of the radio frequency IC chip 5 so as to improve the bonding strength between the power supply circuit board 10 and the radio frequency IC chip 5 .
- the power supply circuit board 10 includes a resonance circuit (not illustrated in FIGS. 7A and 7B ) including an inductance element.
- Outer electrodes 19 a and 19 b are provided on the bottom surface of the power supply circuit board 10
- the connection electrodes 12 a to 12 d are provided on the surface of the power supply circuit board 10 .
- the outer electrodes 19 a and 19 b are electromagnetically coupled to the resonance circuit included in the power supply circuit board 10 , and are electrically connected to connection electrodes 35 a and 35 b of the loop electrode 35 , respectively, with an electroconductive adhesive (not illustrated), for example. Alternatively, such electrical connection may be established by soldering.
- the power supply circuit board 10 includes a resonance circuit having a predetermined resonance frequency so as to transmit a transmission signal of a predetermined frequency output from the radio frequency IC chip 5 to the ground electrode 21 via the outer electrodes 19 a and 19 b and the loop electrode 35 , or select a received signal of a predetermined frequency from among signals received by the ground electrode 21 and supply the selected received signal to the radio frequency IC chip 5 .
- the radio frequency IC chip 5 is operated by a signal received by the ground electrode 21 , and a response signal output from the radio frequency IC chip 5 is emitted from the ground electrode 21 .
- the outer electrodes 19 a and 19 b provided on the bottom surface of the power supply circuit board 10 are coupled to the resonance circuit included in the power supply circuit board 10 by electromagnetic field coupling, and are electrically connected to the loop electrode 35 that is coupled to the ground electrode 21 defining an antenna by electric field coupling.
- the size of the electromagnetic coupling module 1 can be reduced.
- the size of the power supply circuit board 10 can be reduced. Accordingly, IC mounters that have been widely used can be used to mount the radio frequency IC chip 5 on the power supply circuit board 10 . This reduces the cost of mounting. When a frequency band to be used is changed, only the design of the resonance circuit needs to be changed.
- An inductance element alone may be used as an element provided in the power supply circuit board 10 .
- the inductance element has a function of achieving the impedance matching between the radio frequency IC chip 5 and a radiation plate (the ground electrode 21 ).
- FIGS. 8A and 8B are diagrams illustrating a radio frequency IC device according to the seventh preferred embodiment of the present invention. Similar to a radio frequency IC device according to the sixth preferred embodiment, in this radio frequency IC device, the electromagnetic coupling module 1 is formed by mounting the radio frequency IC chip 5 on the power supply circuit board 10 . The electromagnetic coupling module 1 is electrically connected to a loop electrode 36 provided on the printed circuit board 20 . Similar to the loop electrode 31 described in the fourth preferred embodiment, the loop electrode 36 is obtained by forming the cutout 21 a at one side of the ground electrode 21 .
- Connection electrodes 36 a and 36 b are electrically connected to the outer electrodes 19 a and 19 b provided on the bottom surface of the power supply circuit board 10 , with a conductive adhesive (not illustrated), for example.
- a conductive adhesive not illustrated
- the structure and operation of the power supply circuit board 10 are substantially the same as those described in the sixth preferred embodiment, and the operation of the loop electrode 36 is substantially the same as that described in the fourth preferred embodiment.
- FIG. 9 is an exploded view of a printed circuit board 40 included in a radio frequency IC device according to the eighth preferred embodiment of the present invention.
- the printed circuit board 40 is a multilayer board in which a plurality of dielectric layers or magnetic layers are laminated. Loop electrodes 51 A to 51 D are provided on a first layer 41 A defining the surface of the printed circuit board 40 , a second layer 41 B, a third layer 41 C, and a fourth layer 41 D defining the bottom surface of the printed circuit board 40 .
- the loop electrodes 51 A to 51 D are obtained by providing cutouts 50 a to 50 d at ground electrodes 50 A to 50 D provided on the layers 41 A to 41 D.
- Connection electrodes 52 a and 52 b of the loop electrode 51 A provided on the first layer 41 A are respectively electrically connected to the input-output terminal electrodes 6 of the radio frequency IC chip 5 , or are electromagnetically coupled to the power supply circuit board 10 (the electromagnetic coupling module 1 ).
- the ground electrodes 50 A to 50 D may be electrically connected to each other through via-hole conductors.
- An electrode functioning as an antenna may not necessarily be a ground electrode.
- the loop electrode 22 is preferably used so as to cause the ground electrode 21 to function as an antenna, and the loop electrode 22 has an impedance conversion function. More specifically, the loop electrode 22 has an impedance between the connection electrodes 22 a and 22 b which is determined by the shape of the loop. A current corresponding to a signal transmitted from the radio frequency IC chip 5 or the power supply circuit board 10 coupled to the connection electrodes 22 a and 22 b flows along the loop.
- the impedance (Z) between the connection electrodes 22 a and 22 b is represented by the sum of a real part and an imaginary part (X).
- X an imaginary part generated at the loop electrode 22
- the impedance of the loop electrode 22 is significantly reduced. This produces a large impedance difference between the loop electrode 22 and a radio frequency IC chip or a power supply (resonance/matching) circuit. Consequently, sufficient electric power cannot be supplied from the radio frequency IC chip 5 or the power supply circuit to a radiation plate.
- the ground electrode 50 A functions as an antenna and provides the same operational advantages as those described in the first preferred embodiment.
- the size of the loop electrode 51 A which is provided on the first layer 41 A and coupled to the radio frequency IC chip 5 or the power supply circuit board 10 , is greater than that of the other loop electrodes, that is, the loop electrodes 51 B to 51 D. Accordingly, the length of a current path passing through the loop electrode 51 A at the time of communication is increased, the resistance is increased, and the real part is increased. As a result, a higher impedance (Z) is obtained.
- FIG. 10 is an exploded view of the printed circuit board 40 included in a radio frequency IC device according to the ninth preferred embodiment of the present invention.
- a radio frequency IC device according to the ninth preferred embodiment is substantially the same as a radio frequency IC device according to the eighth preferred embodiment except that connection electrodes 54 a and 54 b provided on the first layer 41 A and coupled to the radio frequency IC chip 5 or the power supply circuit board 10 are electrically connected to the loop electrode 51 B provided on the second layer 41 B through via-hole conductors 54 c and the size of the loop electrode 51 B is greater than that of the loop electrodes 51 A, 51 C, and 51 D. Accordingly, the operational advantages of a radio frequency IC device according to the ninth preferred embodiment are substantially the same as those of a radio frequency IC device according to the eighth preferred embodiment.
- FIG. 11 is a diagram illustrating the printed circuit board 20 included in a radio frequency IC device according to the tenth preferred embodiment of the present invention.
- a cutout 21 b is provided at the ground electrode 21 disposed on the surface of the printed circuit board 20 .
- the loop electrode 31 is provided in the cutout 21 b .
- a meandering matching electrode 37 is disposed on the inner side of the loop electrode 31 . Connection electrodes 37 a and 37 b that are the ends of the matching electrode 37 are coupled to the radio frequency IC chip 5 or the power supply circuit board 10 .
- the ground electrode 21 functions as an antenna, and provides substantially the same operational advantages as those described in the first preferred embodiment.
- the meandering matching electrode 37 disposed on the inner side of the loop electrode 31 increases the length of a current path flowing through the loop electrode 31 . The resistance and the real part are therefore increased. As a result, the impedance (Z) is increased.
- the exemplary shape of the matching electrode 37 illustrated in FIG. 11 may be changed in accordance with the shape or size of the cutout 21 b.
- FIG. 12 is a diagram illustrating the main portion of the printed circuit board 20 included in a radio frequency IC device according to the eleventh preferred embodiment of the present invention.
- a radio frequency IC device according to the eleventh preferred embodiment is substantially the same as a radio frequency IC device according to the tenth preferred embodiment except that the loop electrode 31 including the meandering matching electrode 37 on the inner side thereof is disposed in a cutout 21 c of the ground electrode 21 and is coupled to the ground electrode 21 by electric field coupling in substantially the same manner as that described in the first preferred embodiment.
- connection electrodes 37 a and 37 b which are the ends of the matching electrode 37 are coupled to the radio frequency IC chip 5 or the power supply circuit board 10 .
- the ground electrode 21 functions as an antenna, and provides the same operational advantages as those described in the first and tenth preferred embodiments.
- FIG. 13 is an exploded view of the printed circuit board 40 included in a radio frequency IC device according to the twelfth preferred embodiment of the present invention. Similar to a printed circuit board described in the eighth preferred embodiment (see, FIG. 9 ), the printed circuit board 40 is a multilayer board in which a plurality of dielectric layers or a plurality of magnetic layers are laminated. The loop electrodes 51 A to 51 D are provided on the first layer 41 A defining the surface of the printed circuit board 40 , the second layer 41 B, the third layer 41 C, and the fourth layer 41 D defining the bottom surface of the printed circuit board 40 , respectively.
- the loop electrodes 51 A to 51 D are obtained by providing the cutouts 50 a to 50 d at the ground electrodes 50 A to 50 D provided on the layers 41 A to 41 D, respectively.
- Connection electrodes 55 a and 55 b provided on the first layer 41 A are respectively electrically connected to the input-output terminal electrodes 6 of the radio frequency IC chip 5 , or are electromagnetically coupled to the power supply circuit board 10 (the electromagnetic coupling module 1 ).
- the ground electrodes 50 A to 50 D may be electrically connected to each other through via-hole conductors.
- An electrode functioning as an antenna may not necessarily be a ground electrode.
- matching electrodes 56 a and 56 b are disposed on the inner side of the loop electrode 51 B, and matching electrodes 57 a and 57 b are disposed on the inner side of the loop electrode 51 C.
- the connection electrode 55 a is connected to one end of the matching electrode 57 a through a via-hole conductor 58 a
- the other end of the matching electrode 57 a is connected to one end of the matching electrode 56 a through a via-hole conductor 58 b
- the other end of the matching electrode 56 a is connected to an end 50 Aa of the ground electrode 50 A through a via-hole conductor 58 c .
- connection electrode 55 b is connected to one end of the matching electrode 57 b through a via-hole conductor 58 d
- the other end of the matching electrode 57 b is connected to one end of a matching electrode 56 b through a via-hole conductor 58 e
- the other end of the matching electrode 56 b is connected to an end 50 Ab of the ground electrode 50 A through a via-hole conductor 58 f.
- the ground electrode 50 A functions as an antenna, and provides the same operational advantages as those described in the first preferred embodiment. Furthermore, the length of a current path passing through the loop electrode 51 A is increased by the matching electrodes 56 a and 56 b , which are disposed on the inner side of the loop electrode 51 B, and the matching electrodes 57 a and 57 b , which are disposed on the inner side of the loop electrode 51 C. The resistance and the real part are therefore increased. As a result, the impedance (Z) can be increased.
- the matching electrodes 56 a , 56 b , 57 a , and 57 b are included in a laminated structure, the length of a current path can be increased even in a small apparatus and a relatively high impedance (Z) can be obtained.
- FIG. 14 is an exploded view of the printed circuit board 40 included in a radio frequency IC device according to the thirteenth preferred embodiment of the present invention. Similar to the printed circuit board described in the eighth and twelfth preferred embodiments, the printed circuit board 40 is a multilayer board in which a plurality of dielectric layers or a plurality of magnetic layers are laminated. The loop electrodes 51 A to 51 D are provided on the first layer 41 A defining the surface of the printed circuit board 40 , the second layer 41 B, the third layer 41 C, and the fourth layer 41 D defining the bottom surface of the printed circuit board 40 , respectively.
- the loop electrodes 51 A to 51 D are obtained by providing the cutouts 50 a to 50 d in the ground electrodes 50 A to 50 D provided on the layers 41 A to 41 D, respectively.
- a connection electrode 61 provided on the first layer 41 A and the end 50 Aa of the ground electrode 50 A are electrically connected to the input-output terminal electrodes 6 of the radio frequency IC chip 5 , or are electromagnetically coupled to the power supply circuit board 10 (the electromagnetic coupling module 1 ).
- the ground electrodes 50 A to 50 D may be electrically connected to each other through via-hole conductors.
- An electrode functioning as an antenna may not necessarily be a ground electrode.
- matching electrodes 62 and 63 are disposed on the inner sides of the loop electrode 51 B and 51 c , respectively.
- the connection electrode 61 is connected to one end of the matching electrode 63 through a via-hole conductor 64 a
- the other end of the matching electrode 63 is connected to one end of the matching electrode 62 through a via-hole conductor 64 b
- the other end of the matching electrode 62 is connected to the end 50 Ab of the ground electrode 50 A through a via-hole conductor 64 c.
- the ground electrode 50 A functions as an antenna, and provides the same operational advantages as those described in the first preferred embodiment. Furthermore, the length of a current path passing through the loop electrode 51 A is increased by the matching electrodes 62 and 63 which are disposed on the inner sides of the loop electrodes 51 B and 51 C, respectively. The resistance and the real part are therefore increased. As a result, the impedance (Z) can be increased. Similar to the twelfth preferred embodiment, in the thirteenth preferred embodiment, since the matching electrodes 62 and 63 are included in a laminated structure, the length of a current path can be increased in a small apparatus and a relatively high impedance (Z) can be obtained.
- FIG. 15 is a diagram illustrating a first example of a resonance circuit included in the power supply circuit board 10 .
- the power supply circuit board 10 is obtained by laminating, press-bonding, and firing ceramic sheets 11 A to 11 H made of a dielectric material.
- the connection electrodes 12 a and 12 b , the electrodes 12 c and 12 d , and via-hole conductors 13 a and 13 b are provided on the sheet 11 A.
- a capacitor electrode 18 a , conductor patterns 15 a and 15 b , and via-hole conductors 13 c to 13 e are provided.
- a capacitor electrode 18 b On the sheet 11 C, a capacitor electrode 18 b , the via-hole conductors 13 d and 13 e , and a via-hole conductor 13 f are provided.
- conductor patterns 16 a and 16 b On the sheet 11 D, conductor patterns 16 a and 16 b , the via-hole conductors 13 e and 13 f , and via-hole conductors 14 a , 14 b , and 14 d are provided.
- the conductor patterns 16 a and 16 b On the sheet 11 E, the conductor patterns 16 a and 16 b , the via-hole conductors 13 e , 13 f , and 14 a , and via-hole conductors 14 c and 14 e are provided.
- a capacitor electrode 17 On the sheet 11 F, a capacitor electrode 17 , the conductor patterns 16 a and 16 b , the via-hole conductors 13 e and 13 f , and via-hole conductors 14 f and 14 g are provided.
- the conductor patterns 16 a and 16 b and the via-hole conductors 13 e , 13 f , 14 f , and 14 g are provided.
- the conductor patterns 16 a and 16 b and the via-hole conductor 13 f are provided.
- the inductance element L 1 includes the conductor patterns 16 a that are helically connected by the via-hole conductors 14 c , 14 d , and 14 g .
- the inductance element L 2 includes the conductor patterns 16 b that are helically connected by the via-hole conductors 14 b , 14 e , and 14 f .
- the capacitance element C 1 includes the capacitor electrodes 18 a and 18 b .
- the capacitance element C 2 includes the capacitor electrodes 18 b and 17 .
- One end of the inductance element L 1 is connected to the capacitor electrode 18 b through the via-hole conductor 13 d , the conductor pattern 15 a , and the via-hole conductor 13 c .
- One end of the inductance element L 2 is connected to the capacitor electrode 17 through the via-hole conductor 14 a .
- the other ends of the inductance elements L 1 and L 2 are combined on the sheet 11 H, and are then connected to the connection electrode 12 a through the via-hole conductor 13 e , the conductor pattern 15 b , and the via-hole conductor 13 a .
- the capacitor electrode 18 a is electrically connected to the connection electrode 12 b through the via-hole conductor 13 b.
- connection electrodes 12 a and 12 b are respectively electrically connected via the metal bump 8 to the terminal electrodes 6 of the radio frequency IC chip 5 .
- the electrodes 12 c and 12 d are respectively connected to the terminal electrodes 7 of the radio frequency IC chip 5 .
- the outer electrodes 19 a and 19 b are provided by applying a coating of conductive paste thereto, for example.
- the outer electrode 19 a is coupled to the inductance element L (L 1 and L 2 ) by magnetic field coupling.
- the outer electrode 19 b is electrically connected to the capacitor electrode 18 b through the via-hole conductor 13 f .
- the outer electrodes 19 a and 19 b are electrically connected to the connection electrodes 35 a and 35 b of the loop electrode 35 , or are electrically connected to the connection electrodes 36 a and 36 b of the loop electrode 36 .
- the inductance elements L 1 and L 2 are obtained by the substantially parallel arrangement of two conductor patterns, that is, the conductor patterns 16 a and 16 b . Since the line lengths of the conductor patterns 16 a and 16 b are different from each other, the resonance frequencies of the inductance elements L 1 and L 2 are different from one another. Accordingly, a wider frequency band of a radio frequency IC device can be obtained.
- Each of the ceramic sheets 11 A to 11 H may preferably be a ceramic sheet made of a magnetic material, for example.
- the power supply circuit board 10 can be easily obtained by a multilayer board manufacturing process including a sheet lamination method and a thick film printing method, for example.
- Each of the sheets 11 A to 11 H may preferably be a flexible sheet made of a dielectric material, such as polyimide or liquid crystal polymer, for example.
- the inductance elements L 1 and L 2 and the capacitance elements C 1 and C 2 may be included in a laminate obtained by forming an electrode and a conductor on each of the flexible sheets using a thick film formation method and laminating these sheets by thermocompression bonding.
- the inductance elements L 1 and L 2 and the capacitance elements C 1 and C 2 are disposed at different locations in a perspective plan view.
- the inductance elements L 1 and L 2 are coupled to the outer electrode 19 a by magnetic field coupling.
- the outer electrode 19 b functions as one electrode of the capacitance element C 1 .
- the ground electrode 21 receives high-frequency signals (for example, UHF signals) emitted from a reader/writer (not illustrated).
- the electromagnetic coupling module 1 causes a resonance circuit, which is coupled to the outer electrodes 19 a and 19 b by magnetic field coupling and electric field coupling, to resonate via the loop electrode 35 or 36 so as to supply only a received signal that falls within a predetermined frequency range to the radio frequency IC chip 5 .
- predetermined energy is extracted from the received signal, and is then used to cause the resonance circuit to match the frequency of information stored in the radio frequency IC chip 5 to a predetermined frequency and then transmit the information to the ground electrode 21 via the outer electrodes 19 a and 19 b and the loop electrode 35 or 36 .
- the ground electrode 21 transmits or transfers the information to the reader/writer.
- a resonance frequency characteristic is determined by a resonance circuit including the inductance elements L 1 and L 2 and the capacitance elements C 1 and C 2 .
- the resonance frequency of a signal emitted from the ground electrode 21 is determined based on the self-resonance frequency of the resonance circuit.
- the resonance circuit also functions as a matching circuit to perform the impedance matching between the radio frequency IC chip 5 and the ground electrode 21 .
- the power supply circuit board 10 may include a matching circuit separately from a resonance circuit including an inductance element and a capacitance element (in this sense, a resonance circuit is also referred to as a matching circuit). If a matching circuit function is added to a resonance circuit, the design of the resonance circuit becomes complicated. If a matching circuit is provided separately from a resonance circuit, they can be separately designed.
- the loop electrodes 35 and 36 may have an impedance matching function or a resonance circuit function. In this case, by designing a resonance circuit (matching circuit) included in the power supply circuit board 10 in view of the shape of a loop electrode and the size of a ground electrode functioning as a radiation plate, a radiation characteristic can be improved.
- FIG. 16 is a diagram illustrating a second example of a resonance circuit included in a power supply circuit board 70 .
- the power supply circuit board 70 is a flexible PET film on which a helical conductor pattern 72 functioning as an inductance element L and a capacitor electrode 73 functioning as a capacitance element C are provided.
- the electrodes 12 a and 12 b extending from the conductor pattern 72 and the capacitor electrode 73 are respectively electrically connected to the terminal electrodes 6 of the radio frequency IC chip 5 .
- the electrodes 12 c and 12 d provided on the power supply circuit board 70 are respectively electrically connected to the terminal electrodes 7 of the radio frequency IC chip 5 .
- a resonance circuit included in the power supply circuit board 70 includes the inductance element L and the capacitance element C, and is coupled to the electrode 35 a or 36 a facing the inductance element L by magnetic field coupling and the electrode 35 b or 36 b facing the capacitance element C by electric field coupling.
- the power supply circuit board 70 is made of a flexible film, the height of the electromagnetic coupling module 1 is reduced.
- a resonance frequency can be adjusted by changing an inductance value.
- the inductance value can be changed by changing the line width or line space of the conductor pattern 72 , for example.
- the inductance element L is obtained by helically arranging two conductor patterns, that is, the conductor patterns 72 , and connecting them at a central portion of the helical structure.
- the conductor patterns 72 have different inductance values L 1 and L 2 . Accordingly, similar to the first example, since the resonance frequencies of the conductor patterns 72 can be different from one another other, a wider usable frequency band of a radio frequency IC device can be obtained.
- a mobile telephone 80 illustrated in FIG. 17 is usable for a plurality of frequencies.
- Various signals such as a terrestrial digital signal, a GPS signal, a WiFi signal, a CDMA communication signal, and a GSM communication signal are input into the mobile telephone 80 .
- the printed circuit board 20 is disposed.
- a radio communication circuit 90 and the electromagnetic coupling module 1 are disposed on the printed circuit board 20 .
- the radio communication circuit 90 preferably includes an IC chip 91 , a balun 92 included in the printed circuit board 20 , a BPF 93 , and a capacitor 94 , for example.
- the power supply circuit board 10 on which the radio frequency IC chip 5 is mounted is disposed on a loop electrode (for example, the loop electrode 35 described in the sixth preferred embodiment or the loop electrode 36 described in the seventh preferred embodiment) coupled to the ground electrode 21 provided on the printed circuit board 20 , whereby a radio frequency IC device is formed.
- a radio frequency IC device according to the present invention and an electronic apparatus according to the present invention are not limited to the above-described preferred embodiments, and various changes can be made to the present invention without departing from the spirit and scope of the present invention.
- an electrode for transmitting and receiving a high-frequency signal not only a ground electrode but also various other electrodes disposed in or on a circuit board can be used. Furthermore, various types of resonance circuits can be used.
- a material for each of the outer electrode and the power supply circuit board which have been described in the above-described preferred embodiments is provided only as an example. Any suitable material having the required characteristics may be used.
- a power supply circuit board may also have a radio frequency IC chip function so as to define a radio frequency IC chip and a power supply circuit on a single substrate. In this case, the size and profile of a radio frequency IC device can be reduced.
- the electromagnetic coupling module 1 described in the sixth and seventh preferred embodiments may be used, for example.
- a dielectric may be disposed between the electrode of a radio frequency IC chip and the connection electrode of a power supply circuit board so as to provide the capacitive coupling between these electrodes, for example. Furthermore, the capacitive coupling between a radio frequency IC chip and a loop electrode or between a power supply circuit board and a loop electrode may be provided.
- An apparatus including a radio frequency IC device is not limited to a radio frequency communication apparatus, such as a mobile telephone.
- Various apparatuses each provided with a circuit board including a ground electrode for example, home electric appliances such as a television set and a refrigerator, may be used.
- preferred embodiments of the present invention are useful for a radio frequency IC device including a radio frequency IC chip and an electronic apparatus including the radio frequency IC device, and, in particular, has an advantage of obtaining a reduction is size and easily achieving impedance matching without a dedicated antenna.
Abstract
A radio frequency IC device includes a radio frequency IC chip arranged to process a transmitted/received signal, a printed circuit board on which the radio frequency IC chip is mounted, an electrode arrange on the circuit board, and a loop electrode that is arranged on the circuit board so that the loop electrode is electrically connected to the radio frequency IC chip and is coupled to the electrode by electromagnetic coupling. The electrode is coupled to the radio frequency IC chip via the loop electrode so as to transmit or receive a high-frequency signal. A power supply circuit board including a resonance circuit and/or a matching circuit may be disposed between the radio frequency IC chip and the loop electrode.
Description
- 1. Field of the Invention
- The present invention relates to radio frequency IC devices, and, more particularly, to a radio frequency IC device including a radio frequency IC chip used in an RFID (Radio Frequency Identification) system and an electronic apparatus including the radio frequency IC device.
- 2. Description of the Related Art
- Recently, an RFID system has been developed as a product management system in which a reader/writer arranged to generate an induction field communicates with an IC chip (hereinafter also referred to as an IC tag or a radio frequency IC chip) attached to a product or a case in a non-contact manner so as to obtain predetermined information stored in the IC chip.
- Japanese Unexamined Patent Application Publication (Translation of PCT Application) No. 11-515094 discloses an RFID tag including an IC chip mounted on the main surface of a printed circuit board and an antenna provided in the printed circuit board. In this RFID tag, the antenna and the IC chip are electrically connected to each other. The miniaturization of the RFID tag is achieved by providing the antenna in the printed circuit board.
- However, the number of manufacturing processes required to produce the RFID tag is increased in order to prepare the dedicated antenna, and a space is required for the dedicated antenna. This leads to increases in the manufacturing cost and size of the RFID tag. As illustrated in FIG. 2 in Japanese Unexamined Patent Application Publication (Translation of PCT Application) No. 11-515094, the number of manufacturing processes is increased especially if an antenna having a meander shape is formed, since internal electrodes included in a plurality of layers must be processed. Furthermore, in order to achieve the impedance matching between the IC chip and the antenna, a matching section is required. If the matching section is disposed between the antenna and the IC chip, the size of the antenna is increased. Furthermore, if the IC chip is modified, the shape of the antenna must be changed.
- To overcome the problems described above, preferred embodiments of the present invention provide a small radio frequency IC device capable of easily achieving impedance matching without using a dedicated antenna and an electronic apparatus including the radio frequency IC device.
- A radio frequency IC device according to a first preferred embodiment of the present invention includes a radio frequency IC chip arranged to process a transmitted/received signal, a circuit board on which the radio frequency IC chip is mounted, an electrode arranged on the circuit board, and a loop electrode that is arranged on the circuit board so that the loop electrode is coupled to the radio frequency IC chip and the electrode.
- A radio frequency IC device according to a second preferred embodiment of the present invention includes an electromagnetic coupling module including a radio frequency IC chip arranged to process a transmitted/received signal and a power supply circuit board that includes an inductance element coupled to the radio frequency IC chip, a circuit board on which the electromagnetic coupling module is mounted, an electrode arranged on the circuit board, and a loop electrode that is arranged on the circuit board so that the loop electrode is coupled to the power supply circuit board and the electrode.
- In the radio frequency IC device according to the first preferred embodiment, a radio frequency IC chip or a power supply circuit board is preferably coupled to an electrode arranged at a circuit board, for example, a ground electrode via a loop electrode. The electrode arranged on the circuit board functions as a radiation plate (an antenna) for the radio frequency IC chip. That is, the electrode receives a signal, and the radio frequency IC chip receives the signal from the electrode via the loop electrode and is operated by the received signal. A response signal output from the radio frequency IC chip is transmitted to the electrode via the loop electrode, and is then emitted from the electrode to the outside. Accordingly, a dedicated antenna is not required, and a space is not required for the dedicated antenna. The loop electrode can perform the impedance matching between the radio frequency IC chip and the electrode. Accordingly, a matching section is not necessarily required. Therefore, the efficiency of signal transmission between the radio frequency IC chip and the electrode is improved.
- In a radio frequency IC device according to the second preferred embodiment, a power supply circuit board is disposed between a radio frequency IC, for example, a radio frequency IC chip and a loop electrode. This power supply circuit board includes a resonance circuit including an inductance element and/or a matching circuit. A frequency to be used is set by the resonance circuit and/or the matching circuit. If the radio frequency IC chip is changed in accordance with a frequency used by an RFID system, only a change in design of the resonance circuit and/or the matching circuit is required. It is not necessary to change the shape, size, and/or location of a radiation plate (electrode) or the state of coupling between the loop electrode and the electrode or the power supply circuit board. The resonance circuit and/or the matching circuit can also function to achieve the impedance matching between the radio frequency IC chip and the electrode. Accordingly, the efficiency of signal transmission between the radio frequency IC chip and the electrode is improved.
- In the radio frequency IC device, the loop electrode is preferably coupled to the radio frequency IC chip or the power supply circuit board may preferably include a plurality of layers included in a multilayer circuit board.
- The radio frequency IC chip stores various pieces of information about a product to which the radio frequency IC device is attached, and, furthermore, may be a re-writable radio frequency IC chip. That is, the radio frequency IC chip may have an information processing function in addition to an RFID system function.
- According to preferred embodiments of the present invention, an existing electrode included in a circuit board can preferably be used as an antenna. Since a dedicated antenna is not required, a radio frequency IC device and an apparatus including the radio frequency IC device can be miniaturized. A resonance circuit and/or a matching circuit included in a loop electrode and/or a power supply circuit board may have an impedance matching function. Accordingly, a matching section is not necessarily required.
- Other features, elements, steps, characteristics and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments of the present invention with reference to the attached drawings.
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FIG. 1A is a plan view of a radio frequency IC device according to a first preferred embodiment of the present invention. -
FIG. 1B is a cross-sectional view in a lengthwise direction of the radio frequency IC device according to the first preferred embodiment of the present invention. -
FIG. 2 is a perspective view of a radio frequency IC chip. -
FIG. 3A is a plan view of a radio frequency IC device according to a second preferred embodiment of the present invention. -
FIG. 3B is a cross-sectional view in a lengthwise direction of the radio frequency IC device according to the second preferred embodiment of the present invention. -
FIG. 4A is a plan view of a radio frequency IC device according to a third preferred embodiment of the present invention. -
FIG. 4B is a cross-sectional view in a lengthwise direction of the radio frequency IC device according to the third preferred embodiment of the present invention. -
FIG. 4C is a cross-sectional view in a widthwise direction of the radio frequency IC device according to the third preferred embodiment of the present invention. -
FIG. 5A is a plan view of a radio frequency IC device according to a fourth preferred embodiment of the present invention. -
FIG. 5B is a cross-sectional view in a lengthwise direction of the radio frequency IC device according to the fourth preferred embodiment of the present invention. -
FIG. 6A is a plan view of a radio frequency IC device according to a fifth preferred embodiment of the present invention. -
FIG. 6B is a cross-sectional view in a lengthwise direction of the radio frequency IC device according to the fifth preferred embodiment of the present invention. -
FIG. 6C is a cross-sectional view in a widthwise direction of the radio frequency IC device according to the fifth preferred embodiment of the present invention. -
FIG. 7A is a plan view of a radio frequency IC device according to a sixth preferred embodiment of the present invention. -
FIG. 7B is a cross-sectional view in a lengthwise direction of the radio frequency IC device according to the sixth preferred embodiment of the present invention. -
FIG. 8A is a plan view of a radio frequency IC device according to a seventh preferred embodiment of the present invention. -
FIG. 8B is a cross-sectional view in a lengthwise direction of the radio frequency IC device according to the seventh preferred embodiment of the present invention. -
FIG. 9 is an exploded plan view of a circuit board of a radio frequency IC device according to an eighth preferred embodiment of the present invention. -
FIG. 10 is an exploded plan view of a circuit board of a radio frequency IC device according to a ninth preferred embodiment of the present invention. -
FIG. 11 is a plan view of a circuit board of a radio frequency IC device according to a tenth preferred embodiment of the present invention. -
FIG. 12 is a plan view illustrating a main portion of a circuit board of a radio frequency IC device according to an eleventh preferred embodiment of the present invention. -
FIG. 13 is an exploded plan view of a circuit board of a radio frequency IC device according to a twelfth preferred embodiment of the present invention. -
FIG. 14 is an exploded plan view of a circuit board of a radio frequency IC device according to a thirteenth preferred embodiment of the present invention. -
FIG. 15 is an exploded perspective view of a power supply circuit board including a first exemplary resonance circuit. -
FIG. 16 is a plan view of a power supply circuit board including a second exemplary resonance circuit. -
FIG. 17 is a perspective view of a mobile telephone that is an electronic apparatus according to a preferred embodiment of the present invention. -
FIG. 18 is a diagram describing a printed circuit board included in the mobile telephone. - A radio frequency IC device and an electronic apparatus according to preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In the drawings, the same numerals are used for similar components and portions so as to avoid repeated explanation.
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FIGS. 1A and 1B are diagrams illustrating a radio frequency IC device according to the first preferred embodiment of the present invention. This radio frequency IC device includes a radiofrequency IC chip 5 arranged to process a transmitted/received signal of a predetermined frequency, a printedcircuit board 20 on which the radiofrequency IC chip 5 is mounted, and aground electrode 21 and aloop electrode 22 which are arranged on the printedcircuit board 20. Each of theground electrode 21 and theloop electrode 22 is formed on the main surface of the printedcircuit board 20 preferably by applying coating of conductive paste thereto or by etching metal foil on the printedcircuit board 20. - The radio
frequency IC chip 5 includes a clock circuit, a logic circuit, and a memory circuit, and stores necessary information. As illustrated inFIG. 2 , input-output terminal electrodes 6 and mountingterminal electrodes 7 are provided on the undersurface of the radiofrequency IC chip 5. One of the input-output terminal electrodes 6 is electrically connected to a connection electrode 22 a disposed at one end of theloop electrode 22 via ametal bump 8, and the other one of the input-output terminal electrodes 6 is electrically connected to aconnection electrode 22 b disposed at the other end of theloop electrode 22 via themetal bump 8. A pair ofconnection electrodes circuit board 20. One of the mountingterminal electrodes 7 of the radiofrequency IC chip 5 is connected to theconnection electrode 22 c via themetal bump 8, and the other one of the mountingterminal electrodes 7 is connected to theconnection electrode 22 d via themetal bump 8. - The
loop electrode 22 is arranged near the edge of theground electrode 21 in the horizontal direction, whereby theloop electrode 22 and theground electrode 21 are coupled to each other by electric field coupling. That is, by arranging theloop electrode 22 near the ground electrode on the same surface, a loop magnetic field H (denoted by a dotted line inFIG. 1A ) is generated from theloop electrode 22 in the vertical direction. The generated loop magnetic field H enters theground electrode 21 substantially at right angles, so that a loop electric field E (denoted by an alternate long and short dashed line inFIG. 1A ) is excited. The loop electric field E induces another loop magnetic field H. Thus, the loop electric field E and the loop magnetic field H are generated on the entire surface of theground electrode 21, so that a high-frequency signal is emitted. As described above, by arranging theground electrode 21 and theloop electrode 22 close to each other on the same main surface while providing the electrical isolation between them, the electromagnetic field coupling therebetween is effectively achieved. Consequently, a radiation characteristic is improved. - The electromagnetic coupling between the
loop electrode 22 and theground electrode 21 enables a high-frequency signal received by theground electrode 21 from a reader/writer to be transmitted to the radiofrequency IC chip 5 via theloop electrode 22 so as to activate the radiofrequency IC chip 5, and enables a response signal output from the radiofrequency IC chip 5 to be transmitted to theground electrode 21 via theloop electrode 22 and then be emitted from theground electrode 21 toward the reader-writer. - The
ground electrode 21 may preferably be defined by an existing component included in the printedcircuit board 20 of an electronic apparatus containing the radio frequency IC device. Alternatively, a ground electrode used for another electronic component included in an electronic apparatus may be used as theground electrode 21, for example. Accordingly, in this radio frequency IC device, a dedicated antenna is not required, and a space is not required for the antenna. Furthermore, since alarge ground electrode 21 is used, a radiation characteristic is improved. - By controlling the length and width of the
loop electrode 22 and the space between theloop electrode 22 and theground electrode 21, the impedance matching between the radiofrequency IC chip 5 and theground electrode 21 can be achieved. -
FIGS. 3A and 3B are diagrams illustrating a radio frequency IC device according to the second preferred embodiment of the present invention. This radio frequency IC device is substantially the same as a radio frequency IC device according to the first preferred embodiment. Theground electrode 21 and theloop electrode 22 are disposed on the bottom surface of the printedcircuit board 20. Connection electrodes 24 a to 24 d are provided on the surface of the printedcircuit board 20. Theconnection electrodes 24 a and 24 b are electrically connected through a via-hole conductor 23 to one end of theloop electrode 22 and the other end of theloop electrode 22, respectively. The connection electrodes 24 a to 24 d correspond to the connection electrodes 22 a to 22 d illustrated inFIGS. 1A and 1B . One of the input-output terminal electrodes 6 (seeFIG. 2 ) is preferably electrically connected to the connection electrode 24 a via themetal bump 8, for example, and the other one of the input-output terminal electrodes 6 is preferably electrically connected to theconnection electrode 24 b via themetal bump 8, for example. One of the mounting terminal electrodes 7 (see,FIG. 2 ) is preferably connected to the connection electrode 24 c via themetal bump 8, for example, and the other one of the mountingterminal electrodes 7 is preferably connected to the connection electrode 24 d via themetal bump 8, for example. - The
ground electrode 21 and theloop electrode 22 are coupled in substantially the same manner as that described in the first preferred embodiment. The operational advantages of a radio frequency IC device according to the second preferred embodiment are substantially the same as those of a radio frequency IC device according to the first preferred embodiment. In this preferred embodiment, a large space for another electronic component can be obtained on the upper surface of thecircuit board 20. -
FIGS. 4A to 4C are diagrams illustrating a radio frequency IC device according to the third preferred embodiment of the present invention. In this radio frequency IC device, aloop electrode 25 includesconnection electrodes 25 a and 25 b disposed on the surface of the printedcircuit board 20, via-hole conductors 28, and aninternal electrode 29. Theloop electrode 25 is coupled to theground electrode 21 disposed on the bottom surface of the printedcircuit board 20 by electric field coupling. Theconnection electrodes 25 a and 25 b are preferably electrically connected via themetal bump 8 to the terminal electrodes 6 (see,FIG. 2 ).Connection electrodes metal bump 8 to the terminal electrodes 7 (see,FIG. 2 ). - The
loop electrode 25 is arranged near theground electrode 21 in the vertical direction, and is coupled to theground electrode 21 by electric field coupling. That is, a magnetic flux is generated from theloop electrode 25 near the surface on which theground electrode 21 is arranged, and an electric field that intersects the magnetic field substantially at right angles is generated from theground electrode 21. As a result, an electric field loop is excited on theground electrode 21. The excited electric field loop generates a magnetic field loop. Thus, the electric field loop and the magnetic field loop are generated on substantially the entire surface of theground electrode 21, such that a high-frequency signal is emitted. That is, by arranging theloop electrode 25 near theground electrode 21 in the vertical direction while providing the electric isolation between theloop electrode 25 and theground electrode 21, the flexibility in the placement of theloop electrode 25 can be increased. - The operation and operational advantages of a radio frequency IC device according to the third preferred embodiment are substantially the same as those of a radio frequency IC device according to the first preferred embodiment. In this preferred embodiment, since the
loop electrode 25 is disposed in the printedcircuit board 20, interference caused by the penetration of a magnetic field from the outside can be prevented. Theground electrode 21 may be formed in the printedcircuit board 20. In this case, since a large space can be obtained on the main surface and the bottom surface of the printedcircuit board 20, another line or another electronic component may be disposed thereon so as to increase the packing density. -
FIGS. 5A and 5B are diagrams illustrating a radio frequency IC device according to the fourth preferred embodiment of the present invention. This radio frequency IC device includes aloop electrode 31 obtained by providing acutout 21 a at one side of theground electrode 21 disposed on the surface of the printedcircuit board 20.Connection electrodes 31 a and 31 b are electrically connected via themetal bump 8 to one of the input-output terminal electrodes 6 (see,FIG. 2 ) and the other one of the input-output terminal electrodes 6, respectively.Connection electrodes circuit board 20 are electrically connected via themetal bump 8 to the mounting terminal electrodes 7 (see,FIG. 2 ) of the radiofrequency IC chip 5. - In the fourth preferred embodiment, the
loop electrode 31 is electrically coupled to theground electrode 21. The radiofrequency IC chip 5 is coupled to theground electrode 21 via theloop electrode 31 arranged therebetween. The operation and operational advantages of a radio frequency IC device according to the fourth preferred embodiment are substantially the same as those of a radio frequency IC device according to the first preferred embodiment. -
FIGS. 6A to 6C are diagrams illustrating a radio frequency IC device according to the fifth preferred embodiment of the present invention. Similar to a radio frequency IC device according to the fourth preferred embodiment, in this radio frequency IC device, theground electrode 21 is electrically coupled to aloop electrode 32. More specifically, theloop electrode 32 includesconnection electrodes 33 a and 33 b disposed on the surface of the printedcircuit board 20 and via-hole conductors 34. Theground electrode 21 is disposed on the bottom surface of the printedcircuit board 20. The upper end of one of the via-hole conductors 34 is electrically connected to the connection electrode 33 a, and the upper end of the other one of the via-hole conductors 34 is electrically connected to theconnection electrode 33 b. The lower ends of the via-hole conductors 34 are electrically connected to theground electrode 21. Theconnection electrodes 33 a and 33 b are electrically connected via themetal bump 8 to the terminal electrodes 6 (see,FIG. 2 ) of the radiofrequency IC chip 5.Connection electrodes 33 c and 33 d are electrically connected via themetal bump 8 to the terminal electrodes 7 (see,FIG. 2 ) of the radiofrequency IC chip 5. - In the fifth preferred embodiment, the
loop electrode 32 is electrically coupled to theground electrode 21. The radiofrequency IC chip 5 and theground electrode 21 are coupled to each other via theloop electrode 32 disposed therebetween. The operation and operational advantages of a radio frequency IC device according to the fifth preferred embodiment are substantially the same as those of a radio frequency IC device according to the first preferred embodiment. -
FIGS. 7A and 7B are diagrams illustrating a radio frequency IC device according to the sixth preferred embodiment of the present invention. In this radio frequency IC device, anelectromagnetic coupling module 1 is provided by mounting the radiofrequency IC chip 5 on a powersupply circuit board 10. Theelectromagnetic coupling module 1 is electrically connected to aloop electrode 35 provided on the printedcircuit board 20. Similar to theloop electrode 22 described in the first preferred embodiment, theloop electrode 35 is arranged near theground electrode 21 provided on the surface of the printedcircuit board 20, whereby theloop electrode 35 and theground electrode 21 are coupled to each other by magnetic field coupling. - One of the input-
output terminal electrodes 6 of the radiofrequency IC chip 5, which are illustrated inFIG. 2 , and the other one of the input-output terminal electrodes 6 are electrically connected via themetal bump 8 toelectrodes 12 a and 12 b (see,FIGS. 15 and 16 ) provided on the surface of the powersupply circuit board 10. One of the mountingterminal electrodes 7 of the radiofrequency IC chip 5 and the other one of the mountingterminal electrodes 7 are electrically connected via themetal bump 8 toelectrodes 12 c and 12 d. Aprotection film 9 is disposed between the surface of the powersupply circuit board 10 and the bottom surface of the radiofrequency IC chip 5 so as to improve the bonding strength between the powersupply circuit board 10 and the radiofrequency IC chip 5. - The power
supply circuit board 10 includes a resonance circuit (not illustrated inFIGS. 7A and 7B ) including an inductance element.Outer electrodes 19 a and 19 b (see,FIGS. 15 and 16 ) are provided on the bottom surface of the powersupply circuit board 10, and the connection electrodes 12 a to 12 d (see,FIGS. 15 and 16 ) are provided on the surface of the powersupply circuit board 10. Theouter electrodes 19 a and 19 b are electromagnetically coupled to the resonance circuit included in the powersupply circuit board 10, and are electrically connected toconnection electrodes 35 a and 35 b of theloop electrode 35, respectively, with an electroconductive adhesive (not illustrated), for example. Alternatively, such electrical connection may be established by soldering. - That is, the power
supply circuit board 10 includes a resonance circuit having a predetermined resonance frequency so as to transmit a transmission signal of a predetermined frequency output from the radiofrequency IC chip 5 to theground electrode 21 via theouter electrodes 19 a and 19 b and theloop electrode 35, or select a received signal of a predetermined frequency from among signals received by theground electrode 21 and supply the selected received signal to the radiofrequency IC chip 5. Accordingly, in this radio frequency IC device, the radiofrequency IC chip 5 is operated by a signal received by theground electrode 21, and a response signal output from the radiofrequency IC chip 5 is emitted from theground electrode 21. - In the
electromagnetic coupling module 1, theouter electrodes 19 a and 19 b provided on the bottom surface of the powersupply circuit board 10 are coupled to the resonance circuit included in the powersupply circuit board 10 by electromagnetic field coupling, and are electrically connected to theloop electrode 35 that is coupled to theground electrode 21 defining an antenna by electric field coupling. In this preferred embodiment, since a relatively large antenna element is not required as a separate component, the size of theelectromagnetic coupling module 1 can be reduced. Furthermore, the size of the powersupply circuit board 10 can be reduced. Accordingly, IC mounters that have been widely used can be used to mount the radiofrequency IC chip 5 on the powersupply circuit board 10. This reduces the cost of mounting. When a frequency band to be used is changed, only the design of the resonance circuit needs to be changed. - An inductance element alone may be used as an element provided in the power
supply circuit board 10. The inductance element has a function of achieving the impedance matching between the radiofrequency IC chip 5 and a radiation plate (the ground electrode 21). -
FIGS. 8A and 8B are diagrams illustrating a radio frequency IC device according to the seventh preferred embodiment of the present invention. Similar to a radio frequency IC device according to the sixth preferred embodiment, in this radio frequency IC device, theelectromagnetic coupling module 1 is formed by mounting the radiofrequency IC chip 5 on the powersupply circuit board 10. Theelectromagnetic coupling module 1 is electrically connected to aloop electrode 36 provided on the printedcircuit board 20. Similar to theloop electrode 31 described in the fourth preferred embodiment, theloop electrode 36 is obtained by forming thecutout 21 a at one side of theground electrode 21.Connection electrodes 36 a and 36 b are electrically connected to theouter electrodes 19 a and 19 b provided on the bottom surface of the powersupply circuit board 10, with a conductive adhesive (not illustrated), for example. In the seventh preferred embodiment, the structure and operation of the powersupply circuit board 10 are substantially the same as those described in the sixth preferred embodiment, and the operation of theloop electrode 36 is substantially the same as that described in the fourth preferred embodiment. -
FIG. 9 is an exploded view of a printedcircuit board 40 included in a radio frequency IC device according to the eighth preferred embodiment of the present invention. The printedcircuit board 40 is a multilayer board in which a plurality of dielectric layers or magnetic layers are laminated.Loop electrodes 51A to 51D are provided on afirst layer 41A defining the surface of the printedcircuit board 40, asecond layer 41B, athird layer 41C, and afourth layer 41D defining the bottom surface of the printedcircuit board 40. - Similar to the loop electrode described in the fourth preferred embodiment (see,
FIGS. 5A and 5B ), theloop electrodes 51A to 51D are obtained by providing cutouts 50 a to 50 d atground electrodes 50A to 50D provided on thelayers 41A to 41D.Connection electrodes 52 a and 52 b of theloop electrode 51A provided on thefirst layer 41A are respectively electrically connected to the input-output terminal electrodes 6 of the radiofrequency IC chip 5, or are electromagnetically coupled to the power supply circuit board 10 (the electromagnetic coupling module 1). Theground electrodes 50A to 50D may be electrically connected to each other through via-hole conductors. An electrode functioning as an antenna may not necessarily be a ground electrode. - Referring to
FIGS. 1A and 1B , theloop electrode 22 is preferably used so as to cause theground electrode 21 to function as an antenna, and theloop electrode 22 has an impedance conversion function. More specifically, theloop electrode 22 has an impedance between theconnection electrodes 22 a and 22 b which is determined by the shape of the loop. A current corresponding to a signal transmitted from the radiofrequency IC chip 5 or the powersupply circuit board 10 coupled to theconnection electrodes 22 a and 22 b flows along the loop. - The impedance (Z) between the
connection electrodes 22 a and 22 b is represented by the sum of a real part and an imaginary part (X). As the size of theloop electrode 22 is reduced, the length of a current path is reduced. As the length of the current path is reduced, the resistance generated at theloop electrode 22 and the impedance (X=ωL) of an inductance (L) generated by a current passing through the path are reduced. If a space for theloop electrode 22 is reduced in accordance with the miniaturization of an apparatus, such as a mobile telephone, for example, the impedance of theloop electrode 22 is significantly reduced. This produces a large impedance difference between theloop electrode 22 and a radio frequency IC chip or a power supply (resonance/matching) circuit. Consequently, sufficient electric power cannot be supplied from the radiofrequency IC chip 5 or the power supply circuit to a radiation plate. - In order to solve this problem, a higher impedance (Z) must be set for the
loop electrode 22, that is, the real part or the imaginary part (X) must be increased. The eighth to thirteenth preferred embodiments solve such a problem. Accordingly, in the eighth preferred embodiment, theground electrode 50A functions as an antenna and provides the same operational advantages as those described in the first preferred embodiment. Furthermore, in the eighth preferred embodiment, the size of theloop electrode 51A, which is provided on thefirst layer 41A and coupled to the radiofrequency IC chip 5 or the powersupply circuit board 10, is greater than that of the other loop electrodes, that is, theloop electrodes 51B to 51D. Accordingly, the length of a current path passing through theloop electrode 51A at the time of communication is increased, the resistance is increased, and the real part is increased. As a result, a higher impedance (Z) is obtained. -
FIG. 10 is an exploded view of the printedcircuit board 40 included in a radio frequency IC device according to the ninth preferred embodiment of the present invention. A radio frequency IC device according to the ninth preferred embodiment is substantially the same as a radio frequency IC device according to the eighth preferred embodiment except that connection electrodes 54 a and 54 b provided on thefirst layer 41A and coupled to the radiofrequency IC chip 5 or the powersupply circuit board 10 are electrically connected to theloop electrode 51B provided on thesecond layer 41B through via-hole conductors 54 c and the size of theloop electrode 51B is greater than that of theloop electrodes -
FIG. 11 is a diagram illustrating the printedcircuit board 20 included in a radio frequency IC device according to the tenth preferred embodiment of the present invention. Acutout 21 b is provided at theground electrode 21 disposed on the surface of the printedcircuit board 20. In thecutout 21 b, theloop electrode 31 is provided. On the inner side of theloop electrode 31, a meanderingmatching electrode 37 is disposed.Connection electrodes 37 a and 37 b that are the ends of the matchingelectrode 37 are coupled to the radiofrequency IC chip 5 or the powersupply circuit board 10. - Similar to the above-described preferred embodiments, in the tenth preferred embodiment, the
ground electrode 21 functions as an antenna, and provides substantially the same operational advantages as those described in the first preferred embodiment. Themeandering matching electrode 37 disposed on the inner side of theloop electrode 31 increases the length of a current path flowing through theloop electrode 31. The resistance and the real part are therefore increased. As a result, the impedance (Z) is increased. The exemplary shape of the matchingelectrode 37 illustrated inFIG. 11 may be changed in accordance with the shape or size of thecutout 21 b. -
FIG. 12 is a diagram illustrating the main portion of the printedcircuit board 20 included in a radio frequency IC device according to the eleventh preferred embodiment of the present invention. A radio frequency IC device according to the eleventh preferred embodiment is substantially the same as a radio frequency IC device according to the tenth preferred embodiment except that theloop electrode 31 including themeandering matching electrode 37 on the inner side thereof is disposed in acutout 21 c of theground electrode 21 and is coupled to theground electrode 21 by electric field coupling in substantially the same manner as that described in the first preferred embodiment. - Similar to the tenth preferred embodiment, in this preferred embodiment, the
connection electrodes 37 a and 37 b which are the ends of the matchingelectrode 37 are coupled to the radiofrequency IC chip 5 or the powersupply circuit board 10. Theground electrode 21 functions as an antenna, and provides the same operational advantages as those described in the first and tenth preferred embodiments. -
FIG. 13 is an exploded view of the printedcircuit board 40 included in a radio frequency IC device according to the twelfth preferred embodiment of the present invention. Similar to a printed circuit board described in the eighth preferred embodiment (see,FIG. 9 ), the printedcircuit board 40 is a multilayer board in which a plurality of dielectric layers or a plurality of magnetic layers are laminated. Theloop electrodes 51A to 51D are provided on thefirst layer 41A defining the surface of the printedcircuit board 40, thesecond layer 41B, thethird layer 41C, and thefourth layer 41D defining the bottom surface of the printedcircuit board 40, respectively. - The
loop electrodes 51A to 51D are obtained by providing the cutouts 50 a to 50 d at theground electrodes 50A to 50D provided on thelayers 41A to 41D, respectively.Connection electrodes 55 a and 55 b provided on thefirst layer 41A are respectively electrically connected to the input-output terminal electrodes 6 of the radiofrequency IC chip 5, or are electromagnetically coupled to the power supply circuit board 10 (the electromagnetic coupling module 1). Theground electrodes 50A to 50D may be electrically connected to each other through via-hole conductors. An electrode functioning as an antenna may not necessarily be a ground electrode. - Furthermore, matching
electrodes 56 a and 56 b are disposed on the inner side of theloop electrode 51B, and matchingelectrodes 57 a and 57 b are disposed on the inner side of theloop electrode 51C. The connection electrode 55 a is connected to one end of the matching electrode 57 a through a via-hole conductor 58 a, and the other end of the matching electrode 57 a is connected to one end of the matching electrode 56 a through a via-hole conductor 58 b. The other end of the matching electrode 56 a is connected to an end 50Aa of theground electrode 50A through a via-hole conductor 58 c. Theconnection electrode 55 b is connected to one end of the matchingelectrode 57 b through a via-hole conductor 58 d, and the other end of the matchingelectrode 57 b is connected to one end of a matchingelectrode 56 b through a via-hole conductor 58 e. The other end of the matchingelectrode 56 b is connected to an end 50Ab of theground electrode 50A through a via-hole conductor 58 f. - Similar to the above-described preferred embodiments, in the twelfth preferred embodiment, the
ground electrode 50A functions as an antenna, and provides the same operational advantages as those described in the first preferred embodiment. Furthermore, the length of a current path passing through theloop electrode 51A is increased by the matchingelectrodes 56 a and 56 b, which are disposed on the inner side of theloop electrode 51B, and the matchingelectrodes 57 a and 57 b, which are disposed on the inner side of theloop electrode 51C. The resistance and the real part are therefore increased. As a result, the impedance (Z) can be increased. In the twelfth preferred embodiment, since the matchingelectrodes -
FIG. 14 is an exploded view of the printedcircuit board 40 included in a radio frequency IC device according to the thirteenth preferred embodiment of the present invention. Similar to the printed circuit board described in the eighth and twelfth preferred embodiments, the printedcircuit board 40 is a multilayer board in which a plurality of dielectric layers or a plurality of magnetic layers are laminated. Theloop electrodes 51A to 51D are provided on thefirst layer 41A defining the surface of the printedcircuit board 40, thesecond layer 41B, thethird layer 41C, and thefourth layer 41D defining the bottom surface of the printedcircuit board 40, respectively. - The
loop electrodes 51A to 51D are obtained by providing the cutouts 50 a to 50 d in theground electrodes 50A to 50D provided on thelayers 41A to 41D, respectively. Aconnection electrode 61 provided on thefirst layer 41A and the end 50Aa of theground electrode 50A are electrically connected to the input-output terminal electrodes 6 of the radiofrequency IC chip 5, or are electromagnetically coupled to the power supply circuit board 10 (the electromagnetic coupling module 1). Theground electrodes 50A to 50D may be electrically connected to each other through via-hole conductors. An electrode functioning as an antenna may not necessarily be a ground electrode. - Furthermore, matching
electrodes loop electrode 51B and 51 c, respectively. Theconnection electrode 61 is connected to one end of the matchingelectrode 63 through a via-hole conductor 64 a, and the other end of the matchingelectrode 63 is connected to one end of the matchingelectrode 62 through a via-hole conductor 64 b. The other end of the matchingelectrode 62 is connected to the end 50Ab of theground electrode 50A through a via-hole conductor 64 c. - Similar to the above-described preferred embodiments, in the thirteenth preferred embodiment, the
ground electrode 50A functions as an antenna, and provides the same operational advantages as those described in the first preferred embodiment. Furthermore, the length of a current path passing through theloop electrode 51A is increased by the matchingelectrodes loop electrodes electrodes -
FIG. 15 is a diagram illustrating a first example of a resonance circuit included in the powersupply circuit board 10. The powersupply circuit board 10 is obtained by laminating, press-bonding, and firing ceramic sheets 11A to 11H made of a dielectric material. On the sheet 11A, theconnection electrodes 12 a and 12 b, theelectrodes 12 c and 12 d, and via-hole conductors 13 a and 13 b are provided. On thesheet 11B, a capacitor electrode 18 a,conductor patterns 15 a and 15 b, and via-hole conductors 13 c to 13 e are provided. On thesheet 11C, acapacitor electrode 18 b, the via-hole conductors 13 d and 13 e, and a via-hole conductor 13 f are provided. On thesheet 11D,conductor patterns hole conductors 14 a, 14 b, and 14 d are provided. On thesheet 11E, theconductor patterns hole conductors 13 e, 13 f, and 14 a, and via-hole conductors 14 c and 14 e are provided. On the sheet 11F, acapacitor electrode 17, theconductor patterns hole conductors 14 f and 14 g are provided. On thesheet 11G, theconductor patterns hole conductors 13 e, 13 f, 14 f, and 14 g are provided. On thesheet 11H, theconductor patterns - By laminating the sheets 11A to 11H, an inductance element L1, an inductance element L2, a capacitance element C1, and a capacitance element C2 are provided. The inductance element L1 includes the
conductor patterns 16 a that are helically connected by the via-hole conductors 14 c, 14 d, and 14 g. The inductance element L2 includes theconductor patterns 16 b that are helically connected by the via-hole conductors 14 b, 14 e, and 14 f. The capacitance element C1 includes thecapacitor electrodes 18 a and 18 b. The capacitance element C2 includes thecapacitor electrodes - One end of the inductance element L1 is connected to the
capacitor electrode 18 b through the via-hole conductor 13 d, theconductor pattern 15 a, and the via-hole conductor 13 c. One end of the inductance element L2 is connected to thecapacitor electrode 17 through the via-hole conductor 14 a. The other ends of the inductance elements L1 and L2 are combined on thesheet 11H, and are then connected to the connection electrode 12 a through the via-hole conductor 13 e, the conductor pattern 15 b, and the via-hole conductor 13 a. The capacitor electrode 18 a is electrically connected to theconnection electrode 12 b through the via-hole conductor 13 b. - The
connection electrodes 12 a and 12 b are respectively electrically connected via themetal bump 8 to theterminal electrodes 6 of the radiofrequency IC chip 5. Theelectrodes 12 c and 12 d are respectively connected to theterminal electrodes 7 of the radiofrequency IC chip 5. - On the bottom surface of the power
supply circuit board 10, theouter electrodes 19 a and 19 b are provided by applying a coating of conductive paste thereto, for example. The outer electrode 19 a is coupled to the inductance element L (L1 and L2) by magnetic field coupling. Theouter electrode 19 b is electrically connected to thecapacitor electrode 18 b through the via-hole conductor 13 f. As described above, theouter electrodes 19 a and 19 b are electrically connected to theconnection electrodes 35 a and 35 b of theloop electrode 35, or are electrically connected to theconnection electrodes 36 a and 36 b of theloop electrode 36. - In this resonance circuit, the inductance elements L1 and L2 are obtained by the substantially parallel arrangement of two conductor patterns, that is, the
conductor patterns conductor patterns - Each of the ceramic sheets 11A to 11H may preferably be a ceramic sheet made of a magnetic material, for example. In this case, the power
supply circuit board 10 can be easily obtained by a multilayer board manufacturing process including a sheet lamination method and a thick film printing method, for example. - Each of the sheets 11A to 11H may preferably be a flexible sheet made of a dielectric material, such as polyimide or liquid crystal polymer, for example. In this case, the inductance elements L1 and L2 and the capacitance elements C1 and C2 may be included in a laminate obtained by forming an electrode and a conductor on each of the flexible sheets using a thick film formation method and laminating these sheets by thermocompression bonding.
- In the power
supply circuit board 10, the inductance elements L1 and L2 and the capacitance elements C1 and C2 are disposed at different locations in a perspective plan view. The inductance elements L1 and L2 are coupled to the outer electrode 19 a by magnetic field coupling. Theouter electrode 19 b functions as one electrode of the capacitance element C1. - Accordingly, in the
electromagnetic coupling module 1 in which the radiofrequency IC chip 5 is mounted on the powersupply circuit board 10, theground electrode 21 receives high-frequency signals (for example, UHF signals) emitted from a reader/writer (not illustrated). Theelectromagnetic coupling module 1 causes a resonance circuit, which is coupled to theouter electrodes 19 a and 19 b by magnetic field coupling and electric field coupling, to resonate via theloop electrode frequency IC chip 5. On the other hand, predetermined energy is extracted from the received signal, and is then used to cause the resonance circuit to match the frequency of information stored in the radiofrequency IC chip 5 to a predetermined frequency and then transmit the information to theground electrode 21 via theouter electrodes 19 a and 19 b and theloop electrode ground electrode 21 transmits or transfers the information to the reader/writer. - In the power
supply circuit board 10, a resonance frequency characteristic is determined by a resonance circuit including the inductance elements L1 and L2 and the capacitance elements C1 and C2. The resonance frequency of a signal emitted from theground electrode 21 is determined based on the self-resonance frequency of the resonance circuit. - The resonance circuit also functions as a matching circuit to perform the impedance matching between the radio
frequency IC chip 5 and theground electrode 21. The powersupply circuit board 10 may include a matching circuit separately from a resonance circuit including an inductance element and a capacitance element (in this sense, a resonance circuit is also referred to as a matching circuit). If a matching circuit function is added to a resonance circuit, the design of the resonance circuit becomes complicated. If a matching circuit is provided separately from a resonance circuit, they can be separately designed. Theloop electrodes supply circuit board 10 in view of the shape of a loop electrode and the size of a ground electrode functioning as a radiation plate, a radiation characteristic can be improved. -
FIG. 16 is a diagram illustrating a second example of a resonance circuit included in a powersupply circuit board 70. The powersupply circuit board 70 is a flexible PET film on which ahelical conductor pattern 72 functioning as an inductance element L and acapacitor electrode 73 functioning as a capacitance element C are provided. Theelectrodes 12 a and 12 b extending from theconductor pattern 72 and thecapacitor electrode 73 are respectively electrically connected to theterminal electrodes 6 of the radiofrequency IC chip 5. Theelectrodes 12 c and 12 d provided on the powersupply circuit board 70 are respectively electrically connected to theterminal electrodes 7 of the radiofrequency IC chip 5. - Similar to the above-described first example of a resonance circuit, a resonance circuit included in the power
supply circuit board 70 includes the inductance element L and the capacitance element C, and is coupled to the electrode 35 a or 36 a facing the inductance element L by magnetic field coupling and theelectrode supply circuit board 70 is made of a flexible film, the height of theelectromagnetic coupling module 1 is reduced. In the inductance element L, a resonance frequency can be adjusted by changing an inductance value. Preferably, the inductance value can be changed by changing the line width or line space of theconductor pattern 72, for example. - Similar to the first example, in the second example, the inductance element L is obtained by helically arranging two conductor patterns, that is, the
conductor patterns 72, and connecting them at a central portion of the helical structure. Theconductor patterns 72 have different inductance values L1 and L2. Accordingly, similar to the first example, since the resonance frequencies of theconductor patterns 72 can be different from one another other, a wider usable frequency band of a radio frequency IC device can be obtained. - Next, a mobile telephone will be described as an example of an electronic apparatus according to a preferred embodiment of the present invention. A
mobile telephone 80 illustrated inFIG. 17 is usable for a plurality of frequencies. Various signals such as a terrestrial digital signal, a GPS signal, a WiFi signal, a CDMA communication signal, and a GSM communication signal are input into themobile telephone 80. - As illustrated in
FIG. 18 , in acasing 81, the printedcircuit board 20 is disposed. On the printedcircuit board 20, aradio communication circuit 90 and theelectromagnetic coupling module 1 are disposed. Theradio communication circuit 90 preferably includes anIC chip 91, abalun 92 included in the printedcircuit board 20, aBPF 93, and acapacitor 94, for example. The powersupply circuit board 10 on which the radiofrequency IC chip 5 is mounted is disposed on a loop electrode (for example, theloop electrode 35 described in the sixth preferred embodiment or theloop electrode 36 described in the seventh preferred embodiment) coupled to theground electrode 21 provided on the printedcircuit board 20, whereby a radio frequency IC device is formed. - A radio frequency IC device according to the present invention and an electronic apparatus according to the present invention are not limited to the above-described preferred embodiments, and various changes can be made to the present invention without departing from the spirit and scope of the present invention.
- For example, as an electrode for transmitting and receiving a high-frequency signal, not only a ground electrode but also various other electrodes disposed in or on a circuit board can be used. Furthermore, various types of resonance circuits can be used. A material for each of the outer electrode and the power supply circuit board which have been described in the above-described preferred embodiments is provided only as an example. Any suitable material having the required characteristics may be used. A power supply circuit board may also have a radio frequency IC chip function so as to define a radio frequency IC chip and a power supply circuit on a single substrate. In this case, the size and profile of a radio frequency IC device can be reduced.
- In the first to fifth preferred embodiments, instead of a radio frequency IC chip, the
electromagnetic coupling module 1 described in the sixth and seventh preferred embodiments may be used, for example. - In order to mount a radio frequency IC chip on a power supply circuit board, another method other than a method using a metal bump may be used. A dielectric may be disposed between the electrode of a radio frequency IC chip and the connection electrode of a power supply circuit board so as to provide the capacitive coupling between these electrodes, for example. Furthermore, the capacitive coupling between a radio frequency IC chip and a loop electrode or between a power supply circuit board and a loop electrode may be provided.
- An apparatus including a radio frequency IC device is not limited to a radio frequency communication apparatus, such as a mobile telephone. Various apparatuses each provided with a circuit board including a ground electrode, for example, home electric appliances such as a television set and a refrigerator, may be used.
- As described above, preferred embodiments of the present invention are useful for a radio frequency IC device including a radio frequency IC chip and an electronic apparatus including the radio frequency IC device, and, in particular, has an advantage of obtaining a reduction is size and easily achieving impedance matching without a dedicated antenna.
- While preferred embodiments of the present invention have been described above, it is to be understood that variations and modifications will be apparent to those skilled in the art without departing the scope and spirit of the present invention. The scope of the present invention, therefore, is to be determined solely by the following claims.
Claims (29)
1. A radio frequency IC device comprising:
a radio frequency IC chip arranged to process a transmitted/received signal;
a circuit board on which the radio frequency IC chip is mounted;
an electrode arranged on the circuit board; and
a loop electrode arranged on the circuit board so that the loop electrode is coupled to the radio frequency IC chip and to the electrode.
2. The radio frequency IC device according to claim 1 , wherein the loop electrode and the electrode arranged on the circuit board are arranged on the same main surface of the circuit board.
3. The radio frequency IC device according to claim 1 , wherein at least one of the loop electrode and the electrode arranged on the circuit board is disposed in the circuit board.
4. The radio frequency IC device according to claim 1 , wherein the loop electrode and the electrode arranged on the circuit board are electrically isolated from each other.
5. The radio frequency IC device according to claim 1 , wherein the loop electrode and the electrode arranged on the circuit board are electrically connected to each other.
6. The radio frequency IC device according to claim 1 , wherein the circuit board is a multilayer board in which one of a plurality of dielectric layers and a plurality of magnetic layers are laminated.
7. The radio frequency IC device according to claim 1 , wherein the loop electrode provides an impedance matching function.
8. The radio frequency IC device according to claim 6 , wherein the loop electrode is provided on a main surface of the circuit board and is provided on at least one of the plurality of dielectric layers or on at least one of the plurality of magnetic layers.
9. The radio frequency IC device according to claim 6 , wherein the loop electrode is provided on a plurality of layers, and the loop electrode provided on at least one of the plurality of layers is different from the loop electrodes provided on the other ones of the plurality of layers in loop size.
10. The radio frequency IC device according to claim 9 , wherein end portions of the loop electrode that is different from the loop electrodes in loop size are coupled to one of the radio frequency IC chip and the electromagnetic coupling module.
11. The radio frequency IC device according to claim 1 , wherein a matching electrode is disposed on an inner side of the loop electrode.
12. An electronic apparatus comprising the radio frequency IC device according to claim 1 .
13. A radio frequency IC device comprising:
an electromagnetic coupling module including a radio frequency IC arranged to process a transmitted/received signal and a power supply circuit board including an inductance element coupled to the radio frequency IC;
a circuit board on which the electromagnetic coupling module is mounted;
an electrode arranged on the circuit board; and
a loop electrode arranged on the circuit board so that the loop electrode is coupled to the power supply circuit board and to the electrode.
14. The radio frequency IC device according to claim 13 , wherein a resonance circuit is provided in the power supply circuit board.
15. The radio frequency IC device according to claim 13 , wherein a matching circuit is provided in the power supply circuit board.
16. The radio frequency IC device according to claim 13 , wherein the loop electrode and the electrode arranged on the circuit board are arranged on the same main surface of the circuit board.
17. The radio frequency IC device according to claim 13 , wherein at least one of the loop electrode and the electrode arranged on the circuit board is disposed in the circuit board.
18. The radio frequency IC device according to claim 13 , wherein the loop electrode and the electrode arranged on the circuit board are electrically isolated from each other.
19. The radio frequency IC device according to claim 13 , wherein the loop electrode and the electrode arranged on the circuit board are electrically connected to each other.
20. The radio frequency IC device according to claim 13 , wherein the circuit board is a multilayer board in which one of a plurality of dielectric layers and a plurality of magnetic layers are laminated.
21. The radio frequency IC device according to claim 13 , wherein the loop electrode provides an impedance matching function.
22. The radio frequency IC device according to claim 20 , wherein the loop electrode is provided on a main surface of the circuit board and is provided on at least one of the plurality of dielectric layers or on at least one of the plurality of magnetic layers.
23. The radio frequency IC device according to claim 20 , wherein the loop electrode is provided on a plurality of layers, and the loop electrode provided on at least one of the plurality of layers is different from the loop electrodes provided on the other ones of the plurality of layers in loop size.
24. The radio frequency IC device according to claim 23 , wherein end portions of the loop electrode that is different from the loop electrodes in loop size are coupled to one of the radio frequency IC chip and the electromagnetic coupling module.
25. The radio frequency IC device according to claim 13 , wherein a matching electrode is disposed on an inner side of the loop electrode.
26. The radio frequency IC device according to claim 13 , wherein an outer electrode is provided on a surface of the power supply circuit board, the outer electrode being coupled to at least one of a resonance circuit and a matching circuit by electromagnetic field coupling and being electrically connected to the loop electrode.
27. The radio frequency IC device according to claim 13 , wherein the power supply circuit board includes a multilayer board.
28. The radio frequency IC device according to claim 13 , wherein the power supply circuit board includes a flexible board.
29. An electronic apparatus comprising the radio frequency IC device according to claim 1 .
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US12/235,753 US20090021352A1 (en) | 2007-07-18 | 2008-09-23 | Radio frequency ic device and electronic apparatus |
US12/959,454 US8400307B2 (en) | 2007-07-18 | 2010-12-03 | Radio frequency IC device and electronic apparatus |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
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JP2007-186392 | 2007-07-18 | ||
JP2007186392 | 2007-07-18 | ||
US11/851,661 US7830311B2 (en) | 2007-07-18 | 2007-09-07 | Wireless IC device and electronic device |
PCT/JP2008/052129 WO2009011144A1 (en) | 2007-07-18 | 2008-02-08 | Wireless ic device and electronic apparatus |
PCT/JP2008/055962 WO2009011154A1 (en) | 2007-07-18 | 2008-03-27 | Wireless ic device and electronic device |
US12/235,753 US20090021352A1 (en) | 2007-07-18 | 2008-09-23 | Radio frequency ic device and electronic apparatus |
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US11/851,661 Continuation-In-Part US7830311B2 (en) | 2007-07-18 | 2007-09-07 | Wireless IC device and electronic device |
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US12/959,454 Continuation US8400307B2 (en) | 2007-07-18 | 2010-12-03 | Radio frequency IC device and electronic apparatus |
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US12/959,454 Active US8400307B2 (en) | 2007-07-18 | 2010-12-03 | Radio frequency IC device and electronic apparatus |
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