WO2004010530A1 - Portable wireless machine - Google Patents

Abstract

An upper case (1) and a lower case (2) are coupled rotatably at a hinge portion (3). Plate-shaped conductors (4, 5) are laid over the inner surface of the upper case (1). A ground plate (6) is composed of a ground pattern on a circuit board provided inside the lower case (2). One of the plate-shaped conductors (4, 5) is selected by means of a high-frequency switch (14) and connected to one end of a feeding portion (15). The other end of the feeding portion (15) is connected to the ground plate (6), thus constituting a dipole antenna.

Description

 Description Portable radio <Technical field>

 The present invention relates to a portable wireless device such as a mobile phone, and more particularly to a portable wireless device having a structure in which a housing can be folded. Background technology>

 A portable wireless device having a foldable structure generally has a mechanism in which an upper housing and a lower housing are connected by a hinge so that they can be opened and closed, and there are two states, an open state and a closed state. Can be taken. Due to these structural features, the display screen that can be viewed when opened and used (that is, in the open state) can be enlarged, and when closed and used (when closed), it can be made into a compact shape. It has two advantages of portability.

 As an antenna for a foldable mobile phone, Japanese Patent Application Laid-Open No. 2001-45123 describes a protruding antenna provided on a housing.

 Generally, a helical antenna or a telescopic monopole antenna is used for such a protruding antenna. Since the antenna portion protrudes from the housing, the antenna gain when the mobile phone is held by hand is reduced. Can be higher.

 However, since the antenna part has a protruding structure, there are cases where the antenna is caught in a part of the pocket or the like, making it difficult to take out the mobile phone from the pocket or the like.

On the other hand, Japanese Patent Application Laid-Open No. H10-308686 discloses a stripline antenna as an antenna built inside the housing of a foldable mobile phone. Also, Japanese Patent Application Laid-Open No. 2000-284349 describes an antenna with a built-in hinge. Furthermore, Japanese Patent Application Laid-Open No. 2001-156968 describes an antenna built in the upper housing. Japanese Patent Application Laid-Open No. 9-647778 discloses a coiled antenna as an antenna built in the housing of a flip-type mobile phone, and Japanese Patent Application Laid-Open No. 10-1930330. Describes a microstrip line antenna.

 In addition, Japanese Patent Application Laid-Open No. Hei 10-84406 discloses a multi-element built-in antenna combining a dipole antenna, which is a radiating element built in the upper housing, and a parasitic element built in the lower housing. Has been described.

 Since the antenna built in the above-mentioned housing does not have a portion protruding from the housing, the antenna does not catch on a part of a pocket or the like. However, since the direction of the main polarization radiated by the antenna is limited to a specific direction, the mobile phone can be held in the left hand (left hand talk state) or in the right hand (right hand talk state) when talking. However, there is a problem that a difference occurs in the antenna gain.

 Furthermore, with the built-in hinge antenna, when the mobile phone is placed close to the ears and mouth and talking (hereinafter referred to as the talking state), the antenna gain is degraded because the antenna is covered with the hand when the hinge is held by hand. There was a case.

Further, in the flip part built-in antenna, when the antenna gain is degraded was there by the cellular phone main body and the antenna portion in the closed state of the flip portion is proximate ₀

 In addition, in the case of a multi-element built-in antenna, the antenna gain was sometimes deteriorated when the vicinity of the radiating element was covered with a hand when the upper and lower casings were opened.

 An object of the present invention is to provide a portable wireless device including an antenna having high performance even in various use states. Invention disclosure>

The portable wireless device of the present invention includes: a first housing; a second housing; a connecting portion that rotatably connects the first housing and the second housing; A first antenna element provided on the housing; a conductor element provided on the second housing, forming a dipole antenna with the first antenna element; one end electrically connected to the first antenna element; And a power supply unit whose other end is electrically connected to the conductor element. With this configuration, each of the antenna elements housed in the first and second housings integrally operate as a dipole antenna, and the antenna is high when the portable wireless device is held by hand and used. This has the effect that a gain can be obtained. Further, in the portable wireless device according to the present invention, the first housing is provided with a plurality of the first antenna elements, and a switching unit that switches the plurality of the first antenna elements and connects to the power feeding unit. Further provision.

 With this configuration, a directional diversity effect can be obtained, and a high antenna gain can be obtained regardless of whether the mobile phone is held by the left hand or the right hand in a call state. Further, in the portable wireless device of the present invention, the switching unit switches between electrically connecting the plurality of first antenna elements to the power feeding unit or electrically connecting to the conductor element.

 This configuration has an effect that a higher directivity diversity effect can be obtained.

 Further, the portable wireless device of the present invention further includes a half-wavelength element electrically connected between at least one of the plurality of first antenna elements and the switching unit.

 With this configuration, high antenna performance can be obtained even when the portable wireless device is closed.

 Further, the portable wireless device of the present invention further includes a plurality of half-wave elements electrically connected to the plurality of first antenna elements, respectively, and the switching unit includes the plurality of first antenna elements and the plurality of half-wave elements. The half-wave element is selectively switched to be connected to the power supply section.

 With this configuration, high antenna performance can be obtained even when the portable wireless device is closed, and a directional diversity effect can also be obtained. Further, the portable wireless device of the present invention further includes respective impedance matching sections individually corresponding to the plurality of first antenna elements.

 With this configuration, high antenna performance can be obtained even when the portable wireless device is closed. .

Further, in the portable wireless device of the present invention, the first housing and the second housing may be open to each other. And a control unit that controls the switching unit according to the detection result of the housing open / closed state detection unit.

 With this configuration, it is possible to obtain high antenna performance according to the open / closed state of the portable wireless device.

 Further, the portable wireless device of the present invention further includes a control unit that determines the reception level of the wireless circuit unit and controls the switching unit to increase the reception level.

 With this configuration, it is possible to always ensure high antenna performance in various usage states of the portable wireless device.

 Further, in the portable wireless device of the present invention, the antenna element and the conductor element are formed in a plate shape along the housing surfaces of the first housing and the second housing, respectively. . With this configuration, the first housing and the second housing are formed to be thin even though the first antenna element and the conductor element are respectively built in the first housing and the second housing. It has the effect of being able to sufficiently cope with the lightweight and thin portable wireless devices.

 Further, the portable wireless device of the present invention further includes a circuit board provided on the second housing and having a wireless circuit, wherein the conductive element is provided on a circuit board provided inside the second housing. The wireless circuit unit is configured by a ground pattern formed thereon, the ground of the wireless circuit unit is electrically connected to the ground pattern, and the power supply unit is provided in the wireless circuit unit.

 With this configuration, high antenna performance is ensured and the thickness of the portable wireless device can be reduced more easily.

Further, the portable wireless device of the present invention detects a second antenna element provided in the second housing near the connection portion, and an open / closed state of the first housing and the second housing. An opening / closing detection unit, and a switching unit that selects and switches one of the first antenna element and the second antenna element to connect to a signal processing unit that performs signal processing according to a detection result of the opening / closing detection unit. And wherein when the first housing and the second housing are open, the first antenna element and the conductor element form a dipole antenna, and the first housing When the body and the second housing are closed, the second housing The antenna element and the conductor element constitute a monopole antenna.

 With this configuration, high antenna performance can be ensured regardless of whether the upper housing and the lower housing are open or closed.

 Further, in the portable wireless device of the present invention, the switching unit selects the first antenna element when the first housing and the second housing are open, and The second antenna element is selected when the lower housing is closed. With this configuration, high antenna performance can be ensured regardless of whether the upper housing and the lower housing are open or closed. .

 The portable wireless device of the present invention may further include a second antenna element provided in the second housing near the connection, and a reception electric field strength of a signal received by the first antenna element or the second antenna element. A switching unit for selecting and switching an antenna element having a higher reception electric field strength to connect to a signal processing unit for performing signal processing according to a measurement result of the reception electric field strength measurement unit to be measured and the reception electric field strength measurement unit; And wherein the first antenna element has a first feeding point for electrically connecting to the conductor element, and the second antenna element is a second power supply point for electrically connecting to the conductor element. The first power supply point and the second power supply point are located at diagonal positions on opposite sides when the first housing and the second housing are open. Provided.

 With this configuration, a high antenna gain can be obtained in both left-hand and right-hand calls.

 In addition, the portable wireless device of the present invention further includes: a first matching unit that matches the impedance of the first antenna element to a predetermined value; and a second matching unit that matches the impedance of the second antenna element to a predetermined value. Prepare.

 With this configuration, high antenna performance can be ensured. .

The portable wireless device of the present invention may further include a circuit board provided inside the second housing, a plurality of power supply units that supply power to the antenna element, and are separated from each other, A wireless circuit disposed, provided between the plurality of power supply units and the wireless circuit, and selects one of the plurality of power supply units to be connected to the wireless circuit; And a switching unit for switching.

 According to this configuration, the feeding position for the first antenna element can be changed.

. Therefore, since the directivity can be changed, a directivity diversity effect can be obtained, and high antenna performance can be obtained in a call state.

 In addition, the portable wireless device of the present invention includes: a circuit board provided in the second housing; a wireless circuit disposed on the circuit board and electrically connected to the power supply unit; A ground unit for connecting the antenna element to the circuit board; a switching unit for switching whether the ground unit is connected to the circuit board or opened. Further provision.

 According to this configuration, it is possible to switch whether or not the portion of the first antenna element separated from the power supply portion is grounded to the circuit board. Therefore, since the directivity can be changed, a directivity diversity effect can be obtained, and high antenna performance can be obtained in a call state.

 Further, the portable wireless device of the present invention includes a plurality of the grounding portions, and these grounding portions are spaced apart from each other at an end of the antenna element on the side connected to the second housing. .

 According to this configuration, since the directivity can be changed, a directivity diversity effect can be obtained, and high antenna performance can be obtained in a call state.

 In the portable wireless device according to the present invention, the switching unit switches each of the ground units.

 According to this configuration, it is possible to switch whether or not each portion of the first antenna element separated from the power supply portion is grounded to the circuit board. Therefore, since the directivity can be changed, a directivity diversity effect can be obtained, and high antenna performance can be obtained in a call state.

 In the portable wireless device according to the present invention, the connecting portion has conductivity, and the grounding portion is electrically connected to the antenna element via the connecting portion.

According to this configuration, the connecting portion itself can function as a power supply line. Therefore, the step of wiring the power supply line is not required, and the number of assembly steps can be reduced. T JP2003 / 008149

The cost can be reduced.

 Further, in the portable wireless device of the present invention, the connection portion has conductivity, and the power supply portion is electrically connected to the antenna element via the connection portion.

 According to this configuration, the connecting portion itself can function as a power supply line. Therefore, the step of wiring the power supply line is not required, so that the number of assembly steps can be reduced and the cost can be reduced.

 In addition, the portable wireless device of the present invention further includes a control circuit that controls the switching unit according to a level of a received signal received by the wireless circuit.

 According to this configuration, switching to the power supply unit or the ground unit is performed according to the level of the received signal. Therefore, high antenna performance can be obtained regardless of whether the mobile phone is held by the left or right hand in a call.

 Further, in the portable wireless device according to the present invention, the first antenna element is a conductive frame forming a part of the first housing.

 According to this configuration, since the conductive frame that forms a part of the upper housing is used as the antenna element, the thickness of the portable wireless device can be reduced.

<Brief description of drawings>

 FIG. 1 is a schematic configuration diagram of a portable wireless device according to a first embodiment of the present invention, FIGS. 2A and 2B are diagrams showing antenna directivity of the portable wireless device according to the first embodiment,

 FIGS. 3A and 3B are explanatory diagrams for explaining a use state of the portable wireless device according to the first embodiment,

 4A and 4B are diagrams showing the antenna directivity of the portable wireless device according to the first embodiment in a 60-degree tilt state.

 FIG. 5 is a schematic configuration diagram of a portable wireless device according to a second embodiment of the present invention. FIGS. 6A and 6B are diagrams showing antenna directivity of the portable wireless device according to the second embodiment.

FIG. 7 is a schematic configuration diagram of a portable wireless device according to a third embodiment of the present invention, T JP2003 / 008149

FIG. 8 is an explanatory diagram showing an operation of the portable wireless device according to the third embodiment in a closed state (first);

 FIG. 9 is an explanatory diagram showing an operation of the portable wireless device according to the third embodiment in a closed state (second).

 FIGS. 10A and 10B are diagrams showing the antenna directivity of the portable wireless device according to the third embodiment.

 FIG. 11 is a schematic configuration diagram of a portable wireless device according to a fourth embodiment of the present invention, FIG. 12 is a schematic configuration diagram of a portable wireless device according to a fifth embodiment of the present invention, and FIG. FIG. 14 is a schematic configuration diagram of a portable wireless device according to a sixth embodiment of the present invention. FIG. 14 is a front view showing a portable wireless device according to a seventh embodiment of the present invention. FIG. 15 is a portable wireless device of the seventh embodiment. Side view showing the machine,

 FIG. 16 is an explanatory diagram showing a state where the portable wireless device of the seventh embodiment is held with the left hand at a tilt angle of 60 degrees,

 FIG. 17 is an explanatory diagram showing an antenna operation when the portable wireless device of the seventh embodiment selects the first antenna element in a left-hand call state,

 FIG. 18 is an explanatory diagram showing directivity when the portable wireless device of the seventh embodiment selects the first antenna element in a left-hand call state,

 FIG. 19 is an explanatory diagram showing an antenna operation when the portable wireless device of the seventh embodiment selects the second antenna element in a left-hand call state,

 FIG. 20 is an explanatory diagram showing directivity when the portable wireless device of the seventh embodiment selects the second antenna element in a left-hand call state,

 FIG. 21 is an explanatory diagram showing a state where the portable wireless device of the seventh embodiment is held with the right hand at a tilt angle of 60 degrees,

 FIG. 22 is an explanatory diagram showing an antenna operation when the portable wireless device of the seventh embodiment selects the first antenna element in a right-hand call state,

 FIG. 23 is an explanatory diagram showing directivity when the portable wireless device of the seventh embodiment selects the first antenna element in a right-hand call state,

FIG. 24 shows that the portable wireless device of the seventh embodiment uses the second antenna element in a right-hand call state. Explanatory diagram showing the antenna operation when selected,

 FIG. 25 is an explanatory diagram showing directivity when the portable wireless device of the seventh embodiment selects the second antenna element in a right-hand call state,

 FIG. 26 is a front view showing a portable wireless device for explaining the eighth embodiment, FIG. 27 is a diagram for explaining the antenna operation of the portable wireless device according to the eighth embodiment,

 FIG. 28 is a diagram illustrating the antenna directivity of the portable wireless device according to the eighth embodiment. FIG. 29 is a diagram illustrating a call state in which the user holds the portable wireless device according to the eighth embodiment with the left hand. Diagram,

 FIG. 30 is a diagram for explaining the antenna operation of the portable wireless device according to the eighth embodiment,

 FIG. 31 is a diagram illustrating the antenna directivity of the portable wireless device according to the eighth embodiment. FIG. 32 is a diagram illustrating a call state in which the user holds the portable wireless device according to the eighth embodiment with the right hand. Diagram,

 FIG. 33 is a front view showing a portable wireless device for explaining a ninth embodiment, and FIG. 34 is a side view showing a portable wireless device for explaining a ninth embodiment of the present invention. 5 is a front view showing a portable wireless device for explaining a tenth embodiment of the present invention,

 FIG. 36 is a diagram showing the antenna directivity of the portable wireless device according to the tenth embodiment of the present invention.

 FIG. 37 is a diagram showing the antenna directivity of the portable wireless device according to the tenth embodiment of the present invention.

The symbols in the figure, 1, 104, 210 are the upper case, 2, 105, 211 are the lower case, 3, 106, 212a, 212b, 21 2c is a hinge portion, 4 is a plate conductor, 5 is a plate conductor, 6 is a ground plate, 7 is a speaker, 8 is an operation key, 9 is a microphone, 10, 10, 11, 3, 4, 3, 5 and 10 8, 1 1 3 are feed points, 1 2 and 1 3 are feed lines, 1 4, 24, 2 5, 3 1, 3 3 and 3 6 are high frequency switches, 15 is feed section, 3 0 and 3 2 Is a helical element, 37, 38, 110, and 114 are matching circuits, 39 is a control unit, 40 is a magnet switch, 41 is a permanent magnet, 42 is a printed circuit board, 43 is a ground pattern, 44, 112, 224 is a radio circuit part, 45 is a level judgment part, 101,

10 2 is an antenna element, 103 and 22 1 are circuit boards, 1 1 1 is a high-frequency switch, 1 2 7 is a switch control section, 1 28 is an open / close detection section, 203 and 204 are feed sections, 20

5, 206, 222a, 222b, 228 are matching circuits, 213 is a sound port, 214 is a metal frame, 2 15a, 15b, 15c, 19a, 19b, 19 c is a hinge bracket, 216 and 229 are mounting screws, 217 and 226 are screw holes, 218 a, 21

8b and 218c are rotary shafts, 220a, 220b and 220c are power supply terminals, 223, 227a and 227b are switches, and 225 is a control circuit unit.

<Best mode for carrying out the invention>

 (First Embodiment)

 FIG. 1 is a schematic configuration diagram of a portable wireless device according to the first embodiment of the present invention. The portable wireless device according to the present embodiment is a portable wireless device having a folding structure, and is shown in an open state (hereinafter, open state) in FIG. The portable wireless device has an upper case 1, a lower case 2, a hinge part 3, a plate-shaped conductor 4, a plate-shaped conductor 5, a ground plate 6, a speaker 7, an operation key 8, and a microphone 9.

 The upper case 1 and the lower case 2, which are examples of the first case and the second case, are made of an insulating resin and generally have a length of about 100 mm and a width of about 5 Omm. Is set to The upper case 1 and the lower case 2 are rotatably connected to each other at a hinge portion 3, thereby forming a foldable structure.

 A speaker 7 is provided at the upper end of the upper case 1, and a microphone 9 is provided at the lower end of the lower case 2, so that the user can hold a portable wireless device and make a call. In other words, it is configured such that the speaker 7 can be used near the ear and the microphone 9 can be used near the mouth.

The plate-shaped conductors 4 and 5 as an example of the first antenna element are made of a copper plate having a length L1 of about 90 mm and a width L2 of about 15 mm. It is arranged along the surface of case 1. The thickness of the plate-shaped conductors 4 and 5 is set to, for example, about 0.1 mm, and the thickness of the upper case 1 is as small as, for example, about 6 mm. They are arranged so that they do not structurally interfere with other components.

 The daland plate 6 as an example of the conductor element is, for example, a conductor plate having a length L3 of about 90 mm and a width L4 of about 45 mm, and a ground of a circuit board disposed inside the lower case 2. Patterns may be used. The ground plate 6 has a thickness of about lmm or less, and is arranged so as not to structurally interfere with other components such as the operation keys 8 and the microphone 9 inside the lower case 2.

 Feed points 10 and 11 provided below the plate-like conductors 4 and 5 are electrically connected to the high-frequency switch 14 by feeder lines 12 and 13. The power supply line 12 and the power supply line 13 are made of a flexible wire that can be freely bent, so that the upper case 1 can be rotated at the hinge portion 3.

 The high-frequency switch 14 is composed of, for example, an FET or a PIN diode, and appropriately converts the high-frequency signals of the power supply lines 12 and 13 (for example, the directions of the cases 1 and 2 and the power supply lines 12 and 13). Based on the magnitude of the high-frequency signal, the higher-frequency signal is appropriately selected and transmitted to one end of the power supply unit 15. The power supply unit 15 is an antenna power supply unit of a transmission / reception circuit disposed inside the lower case 2, and the other end of the power supply unit 15 is grounded to the ground plate 6.

 In the portable wireless device configured as described above, the operation of the antenna when the radio frequency is set to, for example, 900 MHz (the wavelength is about 3333 mm) will be described as an example.

When the A-side terminal is selected in the high-frequency switch 14, the plate-shaped conductor 4 is selected. In this case, the plate-shaped conductor 4 and the ground plate 6 operate as a dipole antenna having, for example, about a half wavelength. When the high-frequency switch 14 selects the B-side terminal, the plate-shaped conductor 5 and the ground plate 6 similarly operate as a dipole antenna having, for example, about a half wavelength. Therefore, the plate-shaped conductors 4, 5 and The terminal plate 6 operates as a dipole antenna provided in the upper case 1 and the lower case 2 of the portable wireless device.

 Then, the antenna current of the dipole antenna thus configured is distributed over a wide range from the upper ends of the plate-shaped conductors 4 and 5 to the lower end of the ground plate 6. Antenna gain is reduced to a minimum when the user holds only the lower case 2 by hand or holds only the hinge part 3 by hand.

. This is because the antenna current is distributed over a wide range from the upper end of the upper case 1 to the lower end of the lower case 2, and even if the antenna current in a specific part is affected by the hand, the effect on the operation of the entire antenna is small. It is.

 2A and 2B are diagrams showing the directivity of the dipole antenna shown in FIG. In FIG. 2A, directivity 16 and directivity 17 indicate the directivity of the Θ (vertical polarization) component on the XY plane, respectively. Further, in FIG. 2B, directivity 18 and directivity 19 indicate the directivity of the Θ component on the YZ plane, respectively.

 The directivity 16 and the directivity 18 indicate the directivity when the A side of the high-frequency switch 14 in FIG. 1 is selected, that is, when the plate-shaped conductor 4 is selected. The directivity 17 and the directivity 19 indicate the directivity when the B side of the high-frequency switch 14 is selected, that is, when the plate-shaped conductor 5 is selected.

 As can be seen from FIGS. 2A and 2, when the plate conductor 4 is selected, the gain in the Y direction increases, and when the plate conductor 5 is selected, the gain in one Y direction increases. In this way, if the high-frequency switch 14 is used to automatically select the higher-gain plate-like conductor 4 or plate-like conductor 5, the effect of directional diversity can be obtained.

Next, the antenna gain in a call state will be described. FIG. 3A and FIG. 3B are diagrams showing a call state in which the user holds the portable wireless device with the left hand or the right hand and makes a call close to the ear or mouth. As shown in FIGS. 3A and 3B, during a call, the portable wireless device is often held at an angle of about 60 degrees from the Z direction. In addition, it is often not possible to determine whether the user holds the portable radio with his or her left or right hand. Therefore, a high antenna gain is required for a mobile radio antenna in both states shown in Figs. 3A and 3B. In the case of a land mobile communication system such as a mobile phone system, the radio wave arriving at the mobile radio from the radio base station has an elevation angle Θ of 90 degrees in the coordinate system shown in FIGS. 3A and 3B, that is, a horizontal plane. It is known to concentrate in the (XY plane) direction. Therefore, a high antenna gain in the horizontal direction is required for the portable radio antenna in both states shown in FIGS. 3A and 3B.

 FIGS. 4A and 4B show the XZ plane directivity when the portable radio shown in FIG. 1 is placed at an angle of 60 degrees, that is, when the portable radio shown in FIG. 3A and FIG. Each is shown. The coordinate systems in FIGS. 4A and 4B correspond to the coordinate systems shown in FIGS. 3A and 3B, respectively.

 In FIG. 4A, directivity 20 and directivity 21 indicate the directivity of the Θ Θ (vertical polarization) component on the XZ plane when held by the left hand. In FIG. 4B, directivity 22 and directivity 23 indicate the directivity of the Ε Θ (vertical polarization) component of the XZ plane when held by the right hand.

 Further, the directivity 20 and the directivity 22 show the directivity when the A side of the high-frequency switch 14 in FIG. 1 is selected, that is, when the plate-shaped conductor 4 is selected. In addition, the directivity 21 and the directivity 23 indicate the directivity when the B side of the high-frequency switch 14 is selected, that is, when the plate-shaped conductor 5 is selected.

 As can be seen from FIGS. 4A and 4B, when held by the left hand, the directivity 21 with the plate-shaped conductor 5 selected has a higher XY plane gain. Also, when held with the right hand, it can be seen that the directivity 22 with the plate-shaped conductor 4 selected has a higher XY plane gain.

As described above, the gain of the plate-shaped conductors 4 and 5 which are different from each other between the case of holding with the right hand and the case of holding with the left hand is larger. In the present embodiment, utilizing this fact, for example, although not shown, detection of automatically detecting the orientation of cases 1 and 2, that is, the force held by the right hand \ whether the case is held by the left hand Switching means for automatically switching the high-frequency switch 14 shown in FIG. 1 to the one with the larger gain according to the orientation of cases 1 and 2 detected by this detection means, and holding it with the left or right hand. High antenna gain in any of the above call situations. can do. Also, by providing measuring means for measuring the gain of each of the plate conductors 4 and 5, and switching means for automatically switching to a higher gain based on the gain measured by the measuring means, Alternatively, a high antenna gain may be obtained in any call state held by the left hand or the right hand.

 In the present embodiment, two plate-shaped conductors are built in the upper case 1 so as to switch between them, but a single plate-shaped conductor may be provided in the upper case. Also in this case, the antenna gain in a call state can be increased. A similar effect can be obtained with a configuration that operates as a dipole antenna with about a half wavelength.

 Further, the plate-shaped conductor incorporated in the upper case 1 may be composed of, for example, a conductor that mechanically supports the liquid crystal display, or a conductive thin film attached to the resin surface of the upper case 1 Alternatively, it may be composed of a conductive thin film embedded in a resin. In addition, the plate-shaped conductor built into the upper case 1 is located at a position away from the surface of the upper case 1 where the speakers 7 are arranged, in order to reduce the influence of the proximity of the user's head, especially the ears, during a call. That is, it is desirable to be arranged at a position as close as possible to the surface facing the surface on which the speed force 7 is arranged.

 (Second embodiment)

 FIG. 5 is a schematic configuration diagram of a portable wireless device according to the second embodiment of the present invention. The portable wireless device according to the present embodiment is also a portable wireless device having a folding structure, and FIG. 5 shows an open state (hereinafter, an open state). In FIG. 5, the same reference numerals are given to portions overlapping with FIG.

 In the portable wireless device shown in FIG. 5, the plate conductor 4 or the plate conductor 5 in the non-selected state is grounded to the Dutch plate 6, respectively.

In FIG. 5, feeder lines 12, 13 are connected to high-frequency switches 24, 25, respectively. The high-frequency switch 24 performs an operation of switching between transmitting the electric signal of the power supply line 12 to the power supply unit 15 and grounding the ground plate 6. Also, the high frequency switch The switch 25 performs an operation of switching between transmitting the electric signal of the power supply line 13 to the power supply unit 15 and grounding to the ground plate 6. · Here, for example, if the terminal B1 side of the high-frequency switch 25 is selected and the plate-shaped conductor 5 is connected to the power supply unit 15, the high-frequency switch 24 is selected from the terminal A2 side and the plate-shaped conductor 4 Is grounded to the ground plate 6. Conversely, when the terminal A1 side of the high-frequency switch 24 is selected and the plate-shaped conductor 4 is connected to the power supply unit 15, the high-frequency switch 25 is selected on the terminal B2 side and the plate-shaped conductor 5 is connected to the ground plate. Operates to be grounded to 6.

 FIG. 6A and FIG. 6B show the directivity in the state where the operation is performed as described above. In FIG. 6A, directivity 26 and directivity 27 indicate the directivity of the Θ (vertical polarization) component on the XY plane, respectively. In FIG. 6B, the directivity 28 and the directivity 29 are in the YZ plane.

指向 Indicates the directivity of the Θ component.

 The directivity 26 and the directivity 28 are the terminals of the high-frequency switch 24 in FIG.

It shows the directivity in a state where the A1 side and the terminal B2 side of the high-frequency switch 25 are selected, that is, when power is supplied to the plate-shaped conductor 4 and the plate-shaped conductor 5 is grounded to the ground plate 6. Further, the directivity 27 and the directivity 29 indicate the directivity in a state where power is supplied to the plate-shaped conductor 5 and the plate-shaped conductor 4 is grounded to the ground plate 6.

 As can be seen from FIGS. 6A and 6B, the gain in the Y direction increases when the plate-shaped conductor 4 is fed, and the gain in one Y-direction increases when the plate-shaped conductor 5 is fed. This tendency is similar to the tendency shown in Fig. 2, but it can be seen that the change in the maximum gain is larger in Fig. 6. This is because when the plate-shaped conductor on the side to which power is not supplied is grounded to the ground plate 6, these operate as a reflection element. Thus, the directional diversity effect obtained by the configuration shown in FIG. 5 is higher than that obtained by the configuration shown in FIG.

 The configurations of the high-frequency switches 24 and 25 are not limited to those shown in the present embodiment, and the same effects can be obtained as long as the configuration can switch between feeding a plate-shaped conductor or grounding to a ground plate. Is obtained.

(Third embodiment) FIG. 7 is a schematic configuration diagram of a portable wireless device according to the third embodiment of the present invention. The portable wireless device according to the present embodiment is also a portable wireless device having a folding structure, and FIG. 7 shows an open state (hereinafter, open state). In FIG. 7, the same reference numerals are given to portions overlapping with FIG.

 In the portable wireless device shown in FIG. 7, a rectangular element 30 is inserted between the plate-shaped conductor 5 and the high-frequency switch 31.

 In FIG. 7, the helical element 30 is formed by winding a conductive wire in a coil shape, and its electric length is preferably set to approximately a half wavelength at an operating frequency (for example, 900 MHz). In this case, when the helical element 30 is inserted between the plate conductor 5 and the high frequency switch 31, the phase for exciting the plate conductor 5 is inverted.

 8 and 9 are side views of the portable wireless device shown in FIG. 7, and show a state in which the upper case 1 and the lower case 2 are closed (hereinafter, a closed state). FIG. 8 shows a state in which the terminal A1 side of the high-frequency switch 31 shown in FIG. 7 is selected, that is, a state in which the plate-shaped conductor 4 is selected, and FIG. 9 shows a state in which the high-frequency switch 31 shown in FIG. This shows a state where the terminal A2 side of the switch 31 is selected, that is, a state where the plate-shaped conductor 5 is selected.

 In the state shown in FIG. 8, the phases of the antenna currents distributed on the plate-shaped conductor 4 and the ground plate 6 are as indicated by arrows. For this reason, the antenna currents on the plate-shaped conductor 4 and the ground plate 6 cancel each other, and the radiation resistance becomes extremely low, so that the radiation efficiency of the antenna decreases and the impedance mismatch loss increases. As a result, the antenna gain in this state is low, and the bandwidth is reduced.

On the other hand, when the terminal A2 side of the high-frequency switch 31 as shown in FIG. 9 is selected, that is, when the helical element 30 and the plate-like conductor 5 are selected, the plate-like conductor 5 and the ground The phases of the antenna currents distributed on the plate 6 match. FIGS. 10A and 10B show the directivity of the 成分 component on the XY plane and the XZ plane in the state shown in FIG. As can be seen from FIGS. 1OA and 10B, it is understood that the omnidirectional pattern is almost omnidirectional in the horizontal plane (XY plane), and that the XZ plane has an 8-shaped directivity. In this state, high antenna gain and wide bandwidth can be secured. As described above, by switching the high-frequency switch 31 to the terminal A1 side in the open state and to the terminal A2 side in the closed state, high antenna performance can be obtained in both states.

 The helical element 30 has the same effect as long as it has an electrical length of approximately half a wavelength. For example, a meandering pattern printed on a printed circuit board or an insulator may be used. Further, the helical element 30 may be constituted by a meandering conductor as a part of the plate-like conductor 5.

 (Fourth embodiment)

 FIG. 11 is a schematic configuration diagram of a portable wireless device according to the fourth embodiment of the present invention. The portable wireless device in the present embodiment is also a portable wireless device having a folding structure, and FIG. 11 shows an open state (hereinafter, an open state). In FIG. 11, the same reference numerals are given to the portions that overlap with FIG.

 In the portable radio shown in FIG. 11, the helical element 32 is inserted between the feeding point 34 of the plate-shaped conductor 4 and the high-frequency switch 33, and the feeding point 11 of the plate-shaped conductor 5 and the high-frequency switch 33 And are connected.

 In FIG. 11, the helical element 32 has the same electrical characteristics as the helical element 30. The high frequency switch 31 and the high frequency switch 33 are selected by the high frequency switch 36 and supplied to the power supply unit 15.

 In the above configuration, when the terminal A1 side of the high-frequency switch 31 and the terminal B1 side of the high-frequency switch 33 are selected, the plate-shaped conductor 4 or the plate-shaped conductor similar to the configuration shown in FIG. It operates as a dipole antenna composed of the conductor 5 and the ground plate 6. It is desirable to select this state in the open state, in which case a high antenna gain is obtained. Then, at this time, by selecting the plate-shaped conductor 4 or the plate-shaped conductor 5 by the high-frequency switch 36, an effect of directional diversity can be obtained.

Next, in the closed state, it is desirable that the terminal A2 side of the high-frequency switch 31 and the terminal B2 side of the high-frequency switch 33 are selected. In this state, the structure shown in FIG. The antenna operation is the same as that of the above, and a high antenna gain can be obtained in the closed state. At this time, by selecting the plate-shaped conductor 4 or the plate-shaped conductor 5 by the high-frequency switch 36, the effect of the directional diversity in the closed state can be obtained.

 (Fifth embodiment)

 FIG. 12 is a schematic configuration diagram of a portable wireless device according to the fifth embodiment of the present invention. The portable wireless device according to the present embodiment is also a portable wireless device having a folding structure, and FIG. 12 shows an open state (hereinafter, an open state). In FIG. 12, the same parts as those in FIG. 7 are denoted by the same reference numerals.

 The portable wireless device shown in Fig. 12 is provided with matching circuits 37 and 38.When the plate conductor 4 is selected in the open state, or when the plate conductor 5 is selected in the closed state. It is configured to perform appropriate impedance matching for both.

 The portable wireless device shown in FIG. 12 detects the open or closed state of the portable wireless device by adding a control unit 39, a magnet switch 40, and a permanent magnet 41, and responds accordingly. Thus, the high frequency switch 31 is switched.

 In FIG. 12, the matching circuit 37 and the matching circuit 38 are composed of, for example, lumped constant elements such as an inductance and a capacitor. The matching circuit 37 operates so as to match the impedance of the dipole antenna composed of the plate-shaped conductor 4 and the ground plate 6 in the open state to the impedance of the feeder 15 (generally 50 Ω). Further, the matching circuit 38 operates so as to match the impedance of the antenna formed by the plate-shaped conductor 5, the helical element 30 and the round plate 6 in the closed state to the impedance of the feeder 15.

 As described above, by providing an appropriate matching circuit for each plate-shaped conductor and the open / closed state, the antenna performance in each state is further improved.

Next, for example, in the closed state, since the magnet switch 40 and the permanent magnet 41 are close to each other, the magnet switch 40 is turned on, and the control unit 39 detects this and connects the high-frequency switch 31 to the terminal. Operates to switch to the B side. On the other hand, in the open state, the magnet switch 40 is turned off, and the high-frequency switch 31 is closed. 9

Switch to child A side.

 Thus, by selecting an appropriate antenna state according to the result of detecting the open / closed state, a high antenna gain can be obtained in both states.

 The matching circuit is not limited to a lumped element, but may be, for example, a planar circuit provided on a print substrate. Further, the means for detecting the open / closed state is not limited to the magnet switch and the permanent magnet. For example, means for detecting the mechanical operation of the hinge may be used. It may be a means linked to an operation state such as a mode.

 (Sixth embodiment)

 FIG. 13 is a schematic configuration diagram of a portable wireless device according to the sixth embodiment of the present invention. The portable wireless device of the present embodiment is also a portable wireless device having a folding structure, and FIG. 13 shows an open state (hereinafter, open state). In FIG. 13, the same reference numerals are given to portions overlapping FIG. 7 or FIG. 12.

 The portable wireless device shown in FIG. 13 is the portable wireless device shown in FIG. 7 in which the ground plate 6 is constituted by the ground pattern 43 on the printed board 42, and is mounted on the printed board 42. A radio circuit section 44 and a level determination section 45 are added.

 In FIG. 13, as the printed circuit board 42, for example, a glass epoxy substrate having a thickness of about 1 mm is used. The ground pattern 43 is formed of a copper foil pattern printed on the surface or the inner layer of the printed circuit board 42. The ground pattern 43 performs the same function in antenna operation as the ground plate 6 in FIG. With this configuration, it is not necessary to overlap the printed circuit board 42, which is an essential component, with a duland plate that operates as an antenna, so that the lower case 2 of the portable wireless device can be made thinner. it can.

The radio circuit section 44 includes a transmission circuit and a reception circuit, and is covered with an electromagnetic shielding means such as a shield case. The signal selected by the high-frequency switch 31 is transmitted to the radio circuit section 44, and the ground of the radio circuit section 44 is grounded to the ground pattern 43. With this configuration, the plate-shaped conductors 4, 5 and The antenna constituted by the command pattern 43 is supplied with power by the radio circuit section 44.

 Next, the level determination section 45 has a function of determining the level of the reception level obtained in the reception circuit constituting the radio circuit section 44 and a function of switching the high frequency switch 31 accordingly. Specifically, when the high frequency switch 31 is switched to the terminal A side or the terminal B side, the respective reception levels are determined, and the operation is performed so as to select the higher reception level. For example, when the portable wireless device of the present embodiment is applied to a time-division multiple access (TDMA) system of a cellular phone system, the above series of operations are continuously performed at appropriate timing, so that a constantly high antenna gain is obtained. Can be secured.

 (Seventh embodiment)

 FIG. 14 is a front view showing a portable wireless device for explaining a seventh embodiment of the present invention, and FIG. 15 is a side view showing a portable wireless device for explaining a seventh embodiment of the present invention. FIG. As shown in these figures, the portable wireless device of the present embodiment is a foldable portable wireless device in which an upper case 104 and a lower case 105 are connected by a hinge 106. By rotating around the hinge 106, two states can be taken: an open state and a closed state. Note that the upper case 104 and the lower case 105 are formed of a resin molded product that is an insulator.

 In the upper case 104, an antenna element 101 and a speaker 107 having a sound emitting element are provided inside. The antenna element 101 is a plate-shaped conductor plate. However, the present invention is not limited to a plate-shaped conductor plate. For example, a ground pattern of a circuit board provided in the upper case 104 or a metal frame that mechanically supports the speaker 107 may be used. It is also possible to use a metal plate that constitutes 04 itself. The speaker 107 is used when the user listens to voice during a call, and the sound hole surface for sound emission is directed in the X direction in the coordinate system shown in FIG. The user places a call near the speaker 107 on the X side outside the upper case 104 with his / her ear.

Further, in the lower case 105, an antenna element 1 • 2 as an example of a second antenna element and a circuit board 103 as an example of a conductor element are provided inside. The antenna element 102 is an L-shaped conductor plate, and has a hinge 1 inside the lower case 105. The long side portion is arranged near 06 along the Y-axis direction. Note that the long side of the antenna element 102 is, for example, about 1 /: to 1/2 wavelength with respect to the radio signal.

 The circuit board 103 is a printed board on which circuits for realizing the wireless communication function and other various functions are mounted, and a ground pattern serving as a ground potential of the circuit is formed on substantially the entire surface. Further, the circuit board 103 includes a matching circuit 110 as an example of a first matching unit, a matching circuit 114 as an example of a second matching unit, and a high-frequency switch 111 and a switch as an example of a switching unit. It has a control unit 127, a radio circuit unit 112 as an example of a reception electric field strength measurement unit and a signal processing unit, and an open / close detection unit 128 as an example of an open / close detection unit.

 The matching circuit 110 matches the impedance of the antenna element 1 to, for example, 50Ω, and is connected to the antenna element 101 at a feed point 108 via a feed line 109. The matching circuit 110 is disposed at a position closer to the right (Υ) side of the circuit board 103. The feeding point 108 is disposed on the antenna element 101 at a position closer to the right (Υ) side when the portable wireless device is viewed from the front (X) side.

The matching circuit 114 matches the impedance of the antenna element 102 to, for example, 50Ω, and is connected to the antenna element 102 at a feed point 113 via a feed line. The matching circuit 114 is disposed on the circuit board 103 near the left (左側) side, that is, on the side facing the matching circuit 110. The feeding point 113 is located on the antenna element 102 at a position closer to the left (-Υ) side when the portable radio is viewed from the front (X) side, that is, on the side facing the feeding point 108. I have. The high-frequency switch 111 is composed of a diode or a PI diode, and selects one of the matching circuit 110 and the matching circuit 114. The antenna element 101 or The signal received by the antenna element 102 is transmitted to the radio circuit 112. The radio circuit section 112 performs signal processing on the transmission signal and the reception signal, and particularly measures the reception electric field strength of the signal received by the antenna element 101 or the antenna element 102. The open / close detection unit 128 detects the open / close state of the upper case 104 and the lower case 105. This is realized by a hall element, a mechanical switch, or the like.

 In addition, the switch control unit 127 receives the signal according to the detection result of the open / close detection unit 128 or the reception electric field strength of each of the antenna elements 101 and 102 measured by the wireless circuit unit 112. The high-frequency switch 111 is controlled so as to select the antenna element having the higher strength. For reasons described later, the switch control section 127 selects the antenna element 101 side in the open state, and selects the antenna element 102 side in the closed state.

 An operation of the antenna in the portable wireless device of the seventh embodiment including the above components will be described. In the following description, it is assumed that the radio frequency is 1.5 GHz (the wavelength is 200 mm).

First, the antenna operation when the upper case 104 and the lower case 105 are opened as shown in FIG. 14 will be described. In this state, if the matching circuit 110 side, that is, the antenna element 101 side is selected by the high frequency switch 111, the antenna element 101 and the circuit board 103 are arranged in a straight line, so that one wavelength dipole Acts as an antenna. On the other hand, when the matching circuit 111 side, that is, the antenna element 102 side is selected by the high frequency switch 111, the antenna element 102 is not connected to the circuit board 103 via the feeding point 113. balanced feeding, further antenna element 1 0 ² and the antenna element 1 0 1 operates in a state of electromagnetically coupled. Thus, in the open state, high antenna performance can be obtained regardless of which antenna element is selected.

Next, the operation of the antenna when the upper case 104 and the lower case 105 are closed will be described. In this state, if the antenna element 101 is selected by the high-frequency switch 111, the antenna element 101 and the circuit board 103 are close to each other, and the antenna currents are in opposite phases and cancel each other. Performance degrades. On the other hand, when the antenna element 102 is selected by the high-frequency switch 111, the antenna element 102 feeds unbalanced power to the circuit board 103 via the feeding point 113, and is a quarter-wavelength monoport. Since the antenna operates as a single antenna, high antenna performance can be obtained when the antenna element 101 is selected. In this manner, in the closed state, higher antenna performance can be obtained by selecting the antenna element 102 side. PC leak 00 thin ₈₁₄₉

Next, an antenna operation in a state in which the user performs a call while holding the portable wireless device of the present embodiment with the left hand will be described. FIGS. 16 to 20 are explanatory diagrams showing the antenna operation and the directivity when the portable wireless device of the present embodiment is held by the left hand (left-hand communication state). In general, the average tilt angle α at which the user holds the portable wireless device during a call is 60 degrees. FIG. 16 is an explanatory diagram showing a state where the portable wireless device of the present embodiment is held with the left hand at an inclination angle of 60 degrees.

 As shown in FIG. 17, when the antenna element 101 is selected by the high-frequency switch 111, the lower case 105 is held by hand, so that it is provided in the lower case 105. The radiation of the radio wave from the circuit board 103 decreases, and the radiation from the current 115 on the antenna element 101 becomes dominant. As a result, the main polarization component on the horizontal (Χ Υ) plane becomes the horizontal (Ε φ) component. Therefore, as shown in Fig. 18, the horizontal (X Υ) plane directivity is smaller than the vertical polarization (Ε Θ) component directivity 1 19 than the horizontal polarization (Ε φ) component. 0 is higher on the Υ direction side (left hand side).

 On the other hand, as shown in FIG. 19, when the antenna element 102 is selected by the high-frequency switch 111, the antenna element 101 electromagnetically coupled to the current 116 on the antenna element 102 is selected. The emission from the current 1 18 due to the vector combination with the above current 1 17 becomes dominant. As a result, the vertically polarized wave (Θ Θ) component on the horizontal (Χ Υ) plane becomes higher than when the antenna element 101 is selected. Therefore, as shown in Fig. 20, the horizontal (Χ Υ) plane directivity is more directivity of vertical polarization (Ε Θ) component than directivity of horizontal polarization (Ε φ) component. 1 is higher on the Υ direction side (left hand side).

Generally, a pattern averaging gain (PAG) represented by the following equation (1) is used as an index indicating the effective antenna performance of a portable wireless device in a talking state. G _e (φ) and G <p (φ) in Eq. (1) are the horizontal (Χ Υ plane) power directivity of the vertical polarization component and the horizontal polarization component, respectively. C _VH is a correction coefficient related to the cross-polarization power ratio of the incoming wave incident on the antenna (the power ratio of the vertical polarization component to the horizontal polarization component). „〜„

 PCT / JP2003 / 008149

1 f 1 7τ

 ΡΛ = ^ ~ / φ) + 7τ ~ ¾ (Φ Φ

2π j ₀ 2 OVH 2,,

 (ι)

 It is known that the general cross polarization power ratio in the multiplex environment of land mobile communication is 4 to 9 d 9. This is because the power of the vertically polarized incoming wave is greater than the power of the horizontally polarized wave.

4 to 9 dB higher. Therefore, Equation (1) means that the vertical polarization component is weighted and the power directivity in the horizontal plane is averaged. Hereinafter, CVH will be described as 9 dB. For this reason, in a mobile radio antenna, a high pattern averaging gain (PAG) can be obtained by increasing the vertical polarization component in use.

 When the radiation characteristics are shown in FIGS. 18 and 20 using this PAG, the PAG in the state where the antenna element 101 is selected is 15 dBd (dipole ratio gain). Therefore, the PAG when the antenna element 1◦2 is selected is −11.5 dBd, which is 3.5 dB higher. Therefore, in the left-hand call state, the PAG becomes higher when the antenna element 102 is selected.

 Next, an antenna operation in a state where a user performs a call while holding the portable wireless device of the present embodiment with the right hand will be described. FIG. 21 to FIG. 25 are explanatory diagrams showing antenna characteristics and directivity when the portable wireless device of the present embodiment is held by the right hand (right hand communication state). FIG. 21 is an explanatory diagram showing a state where the portable wireless device of the present embodiment is held with the right hand at a tilt angle of 60 degrees.

As shown in Fig. 22, when the antenna element 101 is selected by the high frequency switch 111, the lower case 105 is held by hand, as in the case of the left hand. The radiation of the radio wave from the circuit board 3 decreases, and the radiation from the current 115 on the antenna element 101 becomes dominant. As a result, the vertically polarized (ΕΘ) component in the horizontal (XY) plane is higher than when the antenna element 102 is selected. Therefore, as shown in FIG. 23, the directivity 123 of the vertical polarization (ΕΘ) component is smaller than the directivity 124 of the horizontal polarization (Εφ) component than the horizontal (XY) plane directivity. Higher in the direction side (right hand side). On the other hand, as shown in FIG. 24, when the antenna element 102 side is selected by the high frequency switch 111, the current 116 on the antenna element 101, which is electromagnetically coupled with the current 116 on the antenna element 102, becomes The emission from the current 1 18 due to the vector synthesis becomes dominant. As a result, the horizontal polarization (Εφ) component on the horizontal (XY) plane increases. Therefore, as shown in FIG. 25, the horizontal (ΧΥ ·) plane directivity is smaller in the directivity 126 of the horizontal polarization (Εφ) component than in the directivity 125 of the vertical polarization (ΕΘ) component. Higher in the direction side (right hand side).

 As shown in FIG. 25, the PAG when antenna element 1 is selected is 11 dBd (dipole ratio gain), whereas the PAG when antenna element 102 is selected is 14 dBd. , 3 dB lower. Therefore, in the right-hand communication state, the PAG becomes higher when the antenna element 101 is selected.

 As described above, according to the portable wireless device of the present embodiment, when the upper case 104 and the lower case 105 are opened, either the antenna element 101 or the antenna element 102 having the higher antenna performance is selected. However, if the antenna element 2 is forcibly selected in the closed state, high antenna performance can be ensured in both the open and closed states. In addition, if antenna element 1 is selected in the right-hand call state and antenna element 102 is selected in the left-hand call state, a high antenna gain of 11.5 dB or more is obtained in both left-hand and right-hand calls. Obtainable.

 In this embodiment, as shown in FIG. 14, the feed point 108 of the antenna element 101 is arranged on the right (Y) side, and the feed point 1 13 of the antenna element 102 is placed on the left (one Y). When the arrangement of these feeding points is reversed, the tendency of the PAG in the left-handed call state and the right-handed call state is reversed, but even in such a case, the effect of the diversity operation is the same. Can be obtained. In addition, a circuit board 103 provided in the lower case 105 is used as an antenna element facing the antenna element 101 and the antenna element 102. This antenna element is, for example, a metal plate or an antenna for shielding a circuit. A conductor plate provided exclusively for the element may be used. (Eighth embodiment)

FIG. 26 is a front view showing a portable wireless device for explaining an eighth embodiment of the present invention. is there. As shown in FIG. 26, the portable wireless device according to the eighth embodiment includes an upper case 210 as an example of a first housing and a hinge portion 212a as an example of a connecting portion. A lower case 211 as an example of a second housing rotatably connected to the case 210 is provided. Note that the upper case 210 and the lower case 211 are formed of a molded product of a resin which is an insulator.

 In front of the upper case 210 (in the X direction), a sound port 2 13 for guiding sound generated by a sound element such as a speaker provided inside the upper case 210 is disposed. . The sound opening 2 13 is provided so as to be located near the user's ear when the user holds the foldable portable telephone device 201 by hand to make a call.

In the upper case 210, a plate-shaped conductor 202 is arranged as an example of a first antenna element. Plate conductor 2 0 2, the dimensions of the plate-like conductor ² 0 2, for example, long side L 2 1 is 9 0 mm, a short side L 2 3 is about 4 5 mm. At the lower end (one Z side) of the plate-shaped conductor 202, a power supply point 203 is provided at the left end (one Y side), and a power supply point 204 is provided at the right end (Y side). A matching circuit 205 and a matching circuit 206 are connected to the feeding point 203 and the feeding point 204, respectively, via a feeding line (not shown).

 A circuit board 221 is provided inside the lower case 211. On the circuit board 222, circuit elements for realizing the function of the portable wireless device are mounted, and matching circuits 205, 206, switches 222, wireless circuits 222, and control circuits are provided. 2 2 5 is arranged. The dimensions of the circuit board 22 1 are, for example, about 90 mm on the long side L 22 and about 45 mm on the short side L 23. On the circuit board 221, a ground pattern (not shown) serving as a circuit ground potential is formed on almost the entire surface.

In the matching circuit 205 and the matching circuit 206, the ground ends of the matching circuit 205 and the matching circuit 206 are grounded to the ground patterns on the circuit board 221, respectively. The switch 223 is switched so as to select one of the matching circuit 205 and the matching circuit 206, and the selected matching circuit is connected to the wireless circuit 224. Here, the switch 223 is an example of a switching unit, and is, for example, a high-frequency switch including a FET and a PIN diode. Further, the radio circuit 224 includes a receiving circuit, a transmitting circuit, and the like. The control circuit 225 is connected to the radio circuit 224. The matching circuit that detects the received signal level of the

2 0 5 or the configuration of the performing switching control of Suitsuchi 2 2 3 to select the matching circuit 2 0 6, the plate-like conductor ² 0 2 and the ground pattern and is dipoles formed on the circuit board ² 2 1 Act as an antenna. The matching circuit 205 and the matching circuit 206 match the impedance of the plate-like conductor 202 with the circuit impedance (generally, 50 Ω) of the wireless circuit 224.

 Next, the antenna operation of the portable wireless device according to the eighth embodiment will be described with an example in which the operating frequency is set to 1.5 GHz.

 FIG. 27 is a diagram showing an antenna operation when the switch 223 is switched so as to select the matching circuit 205, that is, the feed point 203. In FIG. 27, components denoted by the same reference numerals as those in FIG. 26 indicate the same components.

 As shown in Fig. 27, when the power supply point 203 is selected, the power supply 230 is connected to the power supply point 203 on the left end (-Y side) of the plate-like conductor 202 and the circuit board 2 It will be connected to the power supply point 2 3 1 on the left end (1 Y side) of 2 1.

 FIG. 28 shows the directivity on the YZ plane of the dipole antenna when the switch 222 is switched to select the matching circuit 205. As shown in the directivity 2400a of FIG. 28, the antenna gain in the Y direction is about 5 dB higher than the gain in one Y direction.

FIG. 29 shows a state in which the user is holding a portable wireless device with his left hand to make a call. In this state, in the portable wireless device, the sound opening 2 13 (see FIG. 26) provided toward the front, that is, in the X direction, is held so as to be located near the left ear of the user. At this time, the Y direction in the coordinate system of FIG. 26 is directed from the zenith direction to the direction slightly inclined forward as viewed from the user as shown in FIG. As shown in FIG. 28, when the switch 2 23 is switched so that the feed point 203 is selected, the antenna gain becomes higher in the Y direction than in the Y direction. High in the direction and low in the direction of the user's shoulder. Therefore, the influence of the shoulder of the user is reduced, and the antenna performance in a call state held by the left hand is improved. FIG. 30 is a diagram showing an antenna operation when the switch 223 is switched so as to select the matching circuit 206, that is, the feed point 204. In FIG. 30, components denoted by the same reference numerals as those in FIG. 26 indicate the same components.

 As shown in FIG. 30, when the power supply point 204 is selected, the power supply 230 is connected to the power supply point 204 on the right end (Y side) of the plate-like conductor 202 and the circuit board 220. It will be connected to the power supply point 2 3 3 on the right end (Y side) of 1.

 FIG. 31 shows the directivity on the YZ plane of the dipole antenna when the switch 222 is switched to select the matching circuit 205. As shown in the directivity 24 Ob in FIG. 31, the antenna gain in one Y direction is about 5 dB higher than the gain in the Y direction. In other words, it exhibits characteristics opposite to the directivity 240a shown in FIG.

 FIG. 32 shows a state in which the user is holding a portable wireless device with his right hand and talking. As described above, when the switch 2 23 is switched so that the feed point 204 is selected, the antenna gain in the —Y direction is higher than that in the Y direction, and the antenna gain is higher in the zenith direction. However, it becomes lower in the direction of the user's shoulder. Therefore, the effect of the user's shoulder is reduced, and the antenna performance in a call state held by the right hand is improved.

 In the present embodiment, the two feeding points are arranged at the left end and the right end of the plate-shaped conductor 202.However, for example, three or more feeding points may be arranged at different positions and switched between them. In this case, three or more different directivities can be obtained.

 In addition, the dimensions of the plate-shaped conductor 202 and the circuit board 222 are not limited to those shown in the eighth embodiment, and the ratio of the length of the short side to the length of the long side is 1/5 or more. If it is on the order, the effect of switching the directivity can be obtained.

 Further, the control circuit 225 may detect the direction of the portable wireless device, that is, which hand the user is holding the portable wireless device, and switch the switch 223 based on the detection result. In that case, the control circuit 225 does not necessarily need to be connected to the radio circuit 224.

According to such a portable wireless device according to the eighth embodiment of the present invention, a plurality of power supply units are provided on the plate-shaped conductor, and these power supply units are switched by the switch 222. PC Orchid 003 麵 149 The directivity of the antenna can be changed, and the directivity diversity effect can be obtained without adding a diversity antenna element. In addition, high antenna performance can be obtained even when holding it with either the left or right hand during a call.

 (Ninth embodiment)

 FIG. 33 is a front view showing a portable wireless device for explaining a ninth embodiment of the present invention. FIG. 34 is a side view showing a portable wireless device for explaining a ninth embodiment of the present invention. 33 and 34, the same reference numerals are given to the same parts as those in FIG. 26, and the description will be omitted.

 As shown in FIG. 33 and FIG. 34, the portable wireless device of the ninth embodiment adopts a structure in which an upper case 210 and a lower case 211 are connected by a hinge portion 212b. By rotating the hinge part 2 12 b around the center, two states, an open state and a closed state, can be taken.

A metal frame 214 is mounted on the front side of the upper case 210 in the drawing (X direction side), that is, on the surface where the sound opening 213 is arranged. The metal frame ² 1 4 has conductivity is not high in and light weight high strength metal, such as magnesium alloy Ru is used. By using this kind of metal, the strength of the thin upper case 210 can be ensured, and the metal frame 214 can function as an antenna element. The length L21 of the long side of the metal frame 214 is, for example, about 9 Omm. The exterior surface of the metal frame 214 is generally coated with a cosmetic coating, but the description is omitted here.

 A circuit board 2 21 is provided inside the lower case 2 1 1, and a matching circuit 2 2 a, 2 2 b, a switch 2 2 3, a radio circuit 2 24, and a control circuit 2 2 Circuit 2 25 is arranged.

The hinges 2 1 2 b are hinge fittings 2 15 a and 2 15 b for connecting the upper case 210 and the lower case 211, and hinge fittings provided inside the lower case 211. 2 19a, 2 19b, hinge shafts 2 15a, 2 15b and hinge shafts 2 18a for rotatably connecting hinge hardware 2 19a, 2 19b, respectively , 2 18 b. Screw holes for attaching the metal frame 2 14 to the upper case 210 are formed in the left and right sides (soil Y direction) of the lower end (1 Z side) of the metal frame 2 14. In addition, screw holes for attaching these to the upper case 210 are also formed in the hinge fittings 2a and 2b formed in an L shape. The mounting screws 2 16 are attached to the screw holes 2 17 of the upper case 210 via the screw holes of the metal frame 2 14 and the hinge fittings 2 15 a and 2 15 b. With this configuration, the metal frame 2 14 and the hinge fittings 2 15 a and 2 15 b are electrically connected, and the upper case 2 10, the metal frame 2 14 and the hinge fitting 2 15 a and 2 15 b is fixed mechanically.

 The hinge bracket 2 15a is rotatable with the hinge bracket 2 19a provided on the left side (one Y side) of the upper end (Z side) of the lower case 2 11 via the rotary shaft 2 18a. The hinge bracket 2 15 b is connected to the hinge bracket 2 19 b provided on the right side (Y side) of the upper end (Z side) of the lower case 211 via the rotating shaft 2 18 b. The hinge brackets 2 19 a and 2 19 b that are rotatably connected are provided with screw holes for attaching to the lower case 2 11, and the power supply terminals 2 20 a and 2 20 b are also provided. Screw holes are drilled. The mounting screw 2 2 9 is screwed into the lower case 2 1 1 through the screw holes 2 2 ◦ a and 2 20 b and the hinge fittings 2 19 a and 2 19 b. 2 Attach to 7). With this configuration, the hinge fittings 2 19 a and 2 19 b are electrically connected to the power supply terminals 220 a and 220 b, respectively, and the lower case 21 1 and the hinge fittings 2 19 a and 2 19 b and the power supply terminals 220 a and 220 b are mechanically fixed, respectively.

Hinge fittings 2 15 a, 2 15 b, Rotating shaft 2 18 a, 2 18 b, Hinge fittings 2 19 a, 2 19 b are made of conductive metal, respectively, between them It is configured to be electrically conductive at the contact point of. Therefore, the metal frame 2 14 has mounting screws 2 16, hinges 2 15 a and 2 15 b, rotating shafts 2 18 a and 2 18 b, hinges 2 19 a and 2 19 b , It is electrically connected to the power supply terminals 220 a and 220 b via the mounting screw 229 and is mechanically fixed. In the lower case 2 1 1, a matching circuit 222 2 a is arranged at a left end (one Y direction) portion of the upper end (Z direction side). Connected to 0a. A matching circuit 222b is arranged at the right end (Y-direction side) of the upper end (Z-direction side) of the lower case 211. This matching circuit 222b is connected to a power supply terminal 220b. It is connected to the. The power supply terminal 22 a is connected to the matching circuit 22 a by, for example, contact with a spring or soldering. Similarly, the power supply terminal 22 Ob is connected to the matching circuit 22 b on the circuit board 22 arranged inside the lower case 21 by, for example, panel contact or soldering. The long side L 24 of the circuit board 21 is, for example, about 90 mm.

 The matching circuit 222 a is connected to the terminal a of the switch 222 on the circuit board 222. The matching circuit 222b is connected to the terminal b of the switch 222. The ground terminals (not shown) of the matching circuits 222 a and 222 b are grounded to a ground pattern on the circuit board 222. The switch 222 is switched so as to select one of the matching circuits 222 a and 222 b, and the selected matching circuit is connected to the radio circuit 222. Here, the switch 222 is a high-frequency switch composed of, for example, an FET or PIN diode. The wireless circuit 222 has a receiving circuit, a transmitting circuit, and the like. The control circuit 225 detects the level of the received signal in the radio circuit 224 and switches so as to select the matching circuit 222 a or the matching circuit 222 b having the higher received signal level. 2 2 3 switching control is performed.

With the above configuration, the metal frame 144 and the hinge portion 212 b and the ground pattern on the circuit board 222 operate as a dipole antenna. At this time, the metal frame 2 14 and the hinge portion 2 12 b operate as a first antenna element having a length L 25 (for example, 110 mm), and the matching circuits 2 2 a and 2 2 2 b Force Match the impedance of this first antenna element to the input impedance (generally 50 Ω) of the radio circuit 224. In addition, the ground pattern on the circuit board 221 having a length of L24 operates as a second antenna element. Here, the hinge bracket 2 1 9 a, 2 1 9 b and the gap G between the ground pattern on the circuit board 2 1 away as possible (e.g. at least 2 mm, or portable radios used 8 0 O MH _Z If λ Ζ 20 or more) It is desirable from the viewpoint of antenna performance.

 Next, the antenna operation of the portable wireless device having the above configuration will be described.

 When the switch 2 23 is switched to select the matching circuit 2 2 a side, that is, the power supply terminal 2 0 a side, the characteristic becomes close to the directivity 2 4 0 a shown in FIG. When the switch 222 is switched so as to select the circuit 222b side, that is, the power supply terminal 222b side, the characteristic becomes close to the directivity 240b shown in FIG. Therefore, a directional diversity effect can be obtained for radio waves arriving at the portable wireless device from various directions.

 Also, as shown in FIG. 29, in a call state held by the left hand, a high antenna performance can be obtained by selecting the matching circuit 222a. Conversely, as shown in FIG. 32, in a call state held by the right hand, a high antenna performance can be obtained even in this state by selecting the matching circuit 222b. Therefore, the switch 22 3 is switched so as to select either the matching circuit 22 2 a or the matching circuit 22 2 b, so that the antenna corresponding to both states held by the left hand or the right hand in a call state can be obtained. It is possible to select a state where the performance is high.

 In the ninth embodiment, two power supply units are arranged at the left end and the right end of the plate-like metal frame 214, but for example, three or more power supply units are arranged at different positions and switched between them. Then, three or more different directivities can be obtained.

 The dimensions of the metal frame 214 and the circuit board 221 are not limited to those shown in the ninth embodiment. If the ratio of the short side to the long side is about 1/5 or more, the directivity is improved. The effect of switching can be obtained.

 Further, in the ninth embodiment, the two hinge fittings are mounted so as to be separated from each other in the left and right direction. However, for example, the hinge fittings 21 a and the hinge fittings 21 b are integrally formed. However, similar effects can be obtained if a plurality of power supply units are configured so as to be separated by a predetermined interval.

Further, the control circuit 225 may detect the orientation of the portable wireless device, that is, which hand the user is holding the portable wireless device, and may switch the switch 223 based on the detection result. In that case, the control circuit 225 does not necessarily connect to the radio circuit 224. It does not need to be followed.

 In the ninth embodiment, the hinge fittings 2 15 a and 2 15 b, the rotating shafts 2 18 a and 2 18 b, and the hinge fittings 2 19 a and 2 19 b are respectively Although it is electrically conducted, it may be configured to be electromagnetically coupled by capacitive reactance.

 According to such a portable wireless device according to the ninth embodiment of the present invention, a plurality of power supply units are connected to a hinge unit connected to a metal frame, and these power supply units are switched by a switch. The directivity can be changed, and the directivity diversity effect can be obtained without adding a diversity antenna element. In addition, high antenna performance can be obtained even when holding with the left or right hand during a call. Further, by making the metal frame forming a part of the upper case have the function of the antenna element, the portable wireless device can be made thinner.

 (10th embodiment)

 FIG. 35 is a front view showing a portable wireless device for explaining a tenth embodiment of the present invention. In FIG. 35, the same parts as those in FIG. 26 are denoted by the same reference numerals, and description thereof will be omitted.

 As shown in FIG. 35, in the portable wireless device according to the tenth embodiment, the upper case 210 has a hinge fitting 2 provided between the hinge fittings 2 15 a and 2 15 b. 15 c, hinge fitting 2 hinge part 2 19c, which is rotatably mounted on a rotating shaft 2 18c, rotating shaft 2 18c, hinge part 2 which is rotatably mounted on a hinge part 2 19c 1 2c is mounted. The power supply terminal 220c attached to the hinge fitting 219c is connected to the hinge part 212c. The power supply terminal 220c is connected to a matching circuit 228 disposed on the circuit board 221 by spring contact or soldering. The matching circuit 228 is connected to the radio circuit 224, and the ground end (not shown) of the matching circuit 228 is grounded to a ground pattern (not shown) on the circuit board. In the tenth embodiment, the power supply terminal 220c and the matching circuit 223 are examples of a power supply unit.

Between the power supply terminal 2 20 a and the ground pattern (not shown) of the circuit board 22 1 The switch 227b is connected between the power supply terminal 220b and a ground pattern (not shown) of the circuit board 221. In the tenth embodiment, the power supply terminals 220a and 220b are examples of a grounding unit. The switches 227a and 227b are high-frequency switches composed of, for example, FETs and PIN diodes, similarly to the switch 223 of FIG. The control circuit 225 detects the level of the received signal in the radio circuit 224, and performs control so as to select the switch (switches 227a and 227b) having the always higher received signal level.

 The antenna operation of the portable wireless device configured as described above will be described.

 In FIG. 35, when the switch 227a is turned on and the switch 227b is turned off, the directivity of the antenna becomes higher in the Y direction as in the directivity 250a shown in FIG. Conversely, when the switch 227a is turned off and the switch 227b is turned on, the gain of the antenna in the Y direction becomes higher as shown by the directivity 25 ° b shown in FIG. In addition, when both the switches 227a and 227b are OFFed, an intermediate directivity between the directivity 250a and the directivity 250b is obtained. Note that when both the switch 227a and the switch 227b are turned ON, the antenna characteristics are deteriorated. Therefore, it is desirable to set the control operation of the control circuit 225 so as not to select this state.

 Therefore, a directional diversity effect is obtained in which three types of directivity can be controlled for incoming radio waves arriving at the portable wireless device from various directions.

 In the call state held by the left hand shown in FIG. 29, high antenna performance can be obtained by setting the switch 227a to N and setting the switch 227b to OFF. Conversely, in a call state held by the right hand as shown in Fig. 32, high antenna performance can be obtained even in this state by setting switch 227a to OFF and switch 227b to ON. Can be

In the tenth embodiment, the power supply unit is disposed at the center, and two grounding units for switching grounding are disposed at both ends.For example, the power supply unit is disposed at one end and the grounding units face each other. Even at one end, a directional diversity effect can be obtained. Further, the control circuit 2 2 5, the orientation of the portable radio, i.e., detects whether the user holds the portable radio in either hand, may be switched Suitsuchi ² 2 3 This detection result. In that case, the control circuit 225 does not necessarily need to be connected to the radio circuit 224.

 In the tenth embodiment, the hinge fittings 2 15 a, 2 15 b, 2 15 c, the rotating shafts 2 18 a, 2 18 b, 2 18 c, and the hinge fitting 2 Although 19a, 219b, and 219c are electrically connected to each other, they may be configured to be electromagnetically coupled by capacitive reactance.

 According to the portable wireless device according to the tenth embodiment of the present invention, the power supply unit and the plurality of ground units are connected to the hinge unit connected to the metal frame, and the ground unit is switched by the switch. Thus, the directivity of the antenna can be changed, and the directional diversity effect can be obtained without adding an antenna element for diversity. In addition, high antenna performance can be obtained even if the user holds the terminal with either the left or right hand during a call. Furthermore, by making the metal frame forming a part of the upper case have the function of an antenna element, it is possible to realize a thin portable wireless device. The present invention will be described in detail and with reference to specific embodiments. However, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.

 This application was filed on July 19, 2002 (Japanese Patent Application No. 2002-210612), filed on January 24, 2003 (Japanese Patent Application No. 2003-015675), and Jun. 12, 2003. Japanese Patent Application (Japanese Patent Application No. 2003-167962), filed on the Japanese Patent Application, the content of which is incorporated herein by reference. <Industrial applicability>

 As described above, according to the portable wireless device of the present invention, high performance can be obtained even in various use states.

Claims

The scope of the claims

1. a first housing;

 A second housing;

 A connecting portion that rotatably connects the first housing and the second housing,

 A first antenna element provided in the first housing;

 A conductor element provided in the second housing and forming a dipole antenna together with the first antenna element;

 A power supply unit having one end electrically connected to the first antenna element and the other end electrically connected to the conductor element;

A portable radio equipped with.

2. The first case according to claim 1, wherein the first housing is provided with a plurality of the first antenna elements, and further includes a switching unit that switches the plurality of the first antenna elements and connects the plurality of first antenna elements to the power feeding unit. The portable radio described.

3. The switching unit according to claim 2, wherein the switching unit switches between electrically connecting the plurality of first antenna elements to the feed unit or electrically connecting to the conductor element. Portable radio.

4. The portable radio according to claim 2, further comprising a half-wave element electrically connected between at least one of the plurality of first antenna elements and the switching unit.

5. The apparatus further comprises a plurality of half-wave elements electrically connected to the plurality of first antenna elements, respectively.

3. The portable radio according to claim 2, wherein the switching unit is configured to selectively switch the plurality of first antenna elements and the plurality of half-wave elements to connect to the power supply unit. Machine.

6. The portable wireless device according to claim 1, further comprising an impedance matching unit individually corresponding to each of the plurality of first antenna elements.

7. A housing open / closed state detection unit for detecting whether the first housing and the second housing are open to each other,

 A control unit that controls the switching unit according to a detection result of the housing open / closed state detection unit;

3. The portable waterless machine according to claim 2, further comprising:

8. The portable wireless device according to claim 2, further comprising a control unit that determines the reception level of the wireless circuit unit and controls the switching unit to increase the reception level. 9. The mobile phone according to claim 1, wherein the antenna element and the conductor element are formed in a plate shape along the housing surfaces of the first housing and the second housing, respectively. transceiver.

10. A circuit board provided on the second housing and having a wireless circuit,

 The conductor element is configured by a ground pattern formed on a circuit board provided inside the second housing,

 10. The portable wireless device according to claim 9, wherein a ground of the wireless circuit unit is electrically connected to the ground pattern, and the power supply unit is provided in the wireless circuit unit.

11. A second antenna element provided in the second housing near the connection portion; An opening / closing detection unit that detects an open / close state of the first housing and the second housing; and a connection to a signal processing unit that performs signal processing according to a detection result of the opening / closing detection unit. A switching unit for selecting and switching one of the antenna element and the second antenna element;

Further comprising

 When the first housing and the second housing are open, the

The element and the conductor element constitute a dipole antenna,

 When the first casing and the second casing are in a closed state,

2. The portable wireless device according to claim 1, wherein the child and the conductor element form a monopole antenna.

1 2. The switching unit

 Selecting the first antenna element when the first housing and the second housing are open,

 12. The portable wireless device according to claim 11, wherein the second antenna element is selected when the upper housing and the lower housing are closed.

13. A second antenna element provided in the second housing in the vicinity of the connection, and a reception field strength measurement unit for measuring a reception field strength of a signal received by the first antenna element or the second antenna element. ,

 A switching unit that switches connection to a signal processing unit that performs signal processing by selecting an antenna element having a larger reception electric field strength according to a measurement result of the reception electric field strength measurement unit;

 The first antenna element has a first feeding point for electrically connecting to the conductor element,

The second antenna element has a second feeding point for electrically connecting to the conductor element, The first power supply point and the second power supply point are provided at diagonal positions on opposite sides when the first housing and the second housing are open. The portable wireless device according to paragraph 1. 14. A first matching unit that matches the impedance of the first antenna element to a predetermined value;

 12. The portable wireless device according to claim 11, further comprising: a second matching unit that matches the impedance of the second antenna element to a predetermined value. 15. A circuit board provided inside the second housing;

 A plurality of power supply units for supplying power to the antenna element and spaced apart from each other;

 A radio circuit arranged on the circuit board,

 A switching unit that is provided between the plurality of power supply units and the wireless circuit, and selects one of the plurality of power supply units and connects to the wireless circuit;

2. The portable wireless device according to claim 1, further comprising:

16. A circuit board provided inside the second housing;

 A wireless circuit disposed on the circuit board and electrically connected to the power supply unit;

 A grounding unit that is arranged apart from the power supply unit and connects the antenna element to the circuit board;

 A switching unit that switches whether the grounding unit is connected to the circuit board or opened.

 2. The portable wireless device according to claim 1, further comprising:

17. A plurality of the grounding portions, wherein the grounding portions are spaced apart from each other at an end of the antenna element on the side connected to the second housing. A portable wireless device according to item 16.

18. The portable wireless device according to claim 17, wherein the switching unit switches each of the grounding units.

19. The portable wireless device according to claim 16, wherein said connecting portion has conductivity, and said grounding portion is electrically connected to said antenna element via said connecting portion.

20. The portable wireless device according to claim 1, wherein the connection portion has conductivity, and the power supply portion is electrically connected to the antenna element via the connection portion.

21. The portable wireless device according to claim 15, further comprising a control circuit that controls said switching unit according to a level of a received signal received by said wireless circuit. 22. The portable wireless device according to claim 1, wherein said first antenna element is a conductive frame forming a part of said first housing.