WO2008023006A1 - Card connector with reduced fext - Google Patents

Card connector with reduced fext Download PDF

Info

Publication number
WO2008023006A1
WO2008023006A1 PCT/EP2007/058658 EP2007058658W WO2008023006A1 WO 2008023006 A1 WO2008023006 A1 WO 2008023006A1 EP 2007058658 W EP2007058658 W EP 2007058658W WO 2008023006 A1 WO2008023006 A1 WO 2008023006A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
electrical conductor
elongated electrical
card connector
disposed
Prior art date
Application number
PCT/EP2007/058658
Other languages
French (fr)
Inventor
Richard Chiu
Leon Wu
Original Assignee
Fci
Fci Connectors Singapore Pte Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fci, Fci Connectors Singapore Pte Ltd filed Critical Fci
Publication of WO2008023006A1 publication Critical patent/WO2008023006A1/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/70—Coupling devices
    • H01R12/71—Coupling devices for rigid printing circuits or like structures
    • H01R12/712—Coupling devices for rigid printing circuits or like structures co-operating with the surface of the printed circuit or with a coupling device exclusively provided on the surface of the printed circuit
    • H01R12/716—Coupling device provided on the PCB
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/70—Coupling devices
    • H01R12/71—Coupling devices for rigid printing circuits or like structures
    • H01R12/72—Coupling devices for rigid printing circuits or like structures coupling with the edge of the rigid printed circuits or like structures
    • H01R12/721—Coupling devices for rigid printing circuits or like structures coupling with the edge of the rigid printed circuits or like structures cooperating directly with the edge of the rigid printed circuits
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/70—Coupling devices
    • H01R12/82—Coupling devices connected with low or zero insertion force
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/646—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00 specially adapted for high-frequency, e.g. structures providing an impedance match or phase match
    • H01R13/6461—Means for preventing cross-talk
    • H01R13/6471—Means for preventing cross-talk by special arrangement of ground and signal conductors, e.g. GSGS [Ground-Signal-Ground-Signal]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/648—Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding  
    • H01R13/658—High frequency shielding arrangements, e.g. against EMI [Electro-Magnetic Interference] or EMP [Electro-Magnetic Pulse]
    • H01R13/6581—Shield structure
    • H01R13/6585—Shielding material individually surrounding or interposed between mutually spaced contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/648—Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding  
    • H01R13/658—High frequency shielding arrangements, e.g. against EMI [Electro-Magnetic Interference] or EMP [Electro-Magnetic Pulse]
    • H01R13/6581—Shield structure
    • H01R13/6585—Shielding material individually surrounding or interposed between mutually spaced contacts
    • H01R13/6589—Shielding material individually surrounding or interposed between mutually spaced contacts with wires separated by conductive housing parts

Definitions

  • the present invention relates to an electrical connector, and more particularly to a circuit card connector.
  • an interface connecting to external devices is generally designed as a bus for transmitting various data.
  • the hardware interface is fabricated to be an expandable slot, e.g. a card connector.
  • the slot is attached to a motherboard of the computer.
  • a modular daughter board or circuit card, such as an interface card or memory card, can be inserted into the slot, so as connect to the motherboard.
  • the differential mode signals transmitted on two conductors are two complementary signals, i.e., having the same amplitude but opposite polarities (with a phase difference of 180 degrees).
  • a better electrical characteristic is obtained by differential mode signal transmission.
  • the time sequence and response capability required by the system can be easily achieved, thereby the probability of the system's misjudging or missing part of the data can be reduced. Therefore, in practice, when an edge connector is used to connect various interface cards and memory modules to the motherboard, each pair of conductors (generally referred to as
  • contacts on one side of the connector is mostly used to transmit signals under the differential mode.
  • a purpose of the present invention is to provide a card connector for transmitting differential mode signals with a good electrical characteristic in an environment of high- 5 density pins and high-speed transmission environment.
  • Figs. IBand 1C are partially enlarged views of Fig. IA;
  • Fig. 2 is a perspective view showing the conductors of a connector of Fig. IA;
  • Fig. 4 is a perspective view showing the conductors of a connector according to another embodiment of the present invention.
  • Fig. 5 is a schematic chart showing far end cross talk test results of a connector according to one embodiment of the present invention, as compared to that of a conventional connector.
  • a card connector 1 includes a housing 20, a plurality pairs of first terminals 38, a plurality pairs of second terminals 39, and first and second elongated electrical conductor, such as metal plates 4a and 4b.
  • Housing 20 has a slot 23 formed by a pair of walls 24 and 25, for receiving a circuit card such as a daughter board (not shown).
  • the plurality pairs of first terminals 38 are disposed in housing 20.
  • Each pair of the first terminals 38a, 38b has a contact portion 32c, 32a and a connection portion 32d, 32b.
  • Connection portions 32d and 32b of the plurality pairs of first terminals 38 are bent from respective contact portions along a first direction 138.
  • the plurality pairs of second terminals 39 are disposed in housing 20, in a manner staggered with respect to the plurality pairs of first terminals 38.
  • Each pair of the second terminals 39a, 39b has a contact portion 36c, 36a and a connection portion 36d, 36b.
  • Connection portions 36d and 36b of the plurality pairs of second terminals 38 are bent from respective contact portions along a second direction 139 which is opposite to first direction 138.
  • first and second plates 4a and 4b are positioned such that when card connector 1 is attached to a PCB, there remains a gap between first and second plates 4a and 4b and the PCB, i.e. first and second plates 4a and 4b do not contact the PCB.
  • first and second plates 4a and 4b may have barbs 42 and/or projections 44 formed on the side walls. Recesses 242, 244 may also be provided in housing 20 for receiving barbs 42 and/or projections 44.
  • barbs 42, projections 44 and the corresponding housing portion may be deformed, so that metal plates 4a and 4b can be firmly fixed to housing 20.
  • the groove or recess provided on housing 20 may be slightly narrower than the thickness of plates 4a and 4b, and plates 4a and 4b can be inserted and fixed into the groove or recess by interference fit.
  • Fig. 4 shows the conductors and metal plate structure of a card connector according to another embodiment of the invention.
  • conductors 38 and 39 form connection pin rows 52, 54, 56 and 58.
  • connection pin rows 52, 54, 56 and 58 Between second row 54 and third row 56, there is defined a third channel within which, a third plate 4c is disposed.
  • a card connector With one or more metal plates disposed between the conductor rows, a card connector can achieve a far-end cross talk performance improvement of about 1 to 2.5 db, when the connector is used for transmission of 2.0 - 4.0 GHz signals, compared to a conventional connector, as shown in Fig. 5.
  • An added advantages is that, as the housing is made of insulative material and with the insertion of the metal place(s), the strength and rigidity of the housing is increased.

Landscapes

  • Details Of Connecting Devices For Male And Female Coupling (AREA)

Abstract

A card connector for transmitting electrical signals with a reduced far end cross talk level is provided. The connector has a housing and a plurality of electrically conductive terminals disposed in the housing. Each terminal has a connecting portion disposed along a first row and a second row defining a channel therebetween. An elongated electrical conductor is attached to the housing and disposed in the channel. The elongated electrical conductor can effectively reduce far end cross talk level of the connector, as well as increase the strength and rigidity of the connector.

Description

CARD CONNECTOR WITH REDUCED FEXT
Field of the Invention
The present invention relates to an electrical connector, and more particularly to a circuit card connector.
Background of the Invention
In a computer or telecommunication system, an interface connecting to external devices is generally designed as a bus for transmitting various data. The hardware interface is fabricated to be an expandable slot, e.g. a card connector. The slot is attached to a motherboard of the computer. A modular daughter board or circuit card, such as an interface card or memory card, can be inserted into the slot, so as connect to the motherboard.
In recent years, the speed of central processing unit (CPU) for computers is improved continuously, from the earliest 33 MHz, 66 MHz, to Pentium III 500 MHz and to the latest Pentium IV 3.06 GHz. As such, the electronic signal transmission speeds of main board and computer peripherals must be increased accordingly, so as to match the processing speed of the CPU.
Signal transmission through a connector can be classified into two modes, namely single-ended signal and differential mode signal. The single-ended signal means that only one conductor is used when transmitting one signal between two electronic elements or devices that are connected. The transmission of a differential mode signal requires two matching conductors, so as to transmit the signals back and forth between two electronic elements or devices that are connected.
The differential mode signals transmitted on two conductors are two complementary signals, i.e., having the same amplitude but opposite polarities (with a phase difference of 180 degrees). In a high-speed transmission environment, a better electrical characteristic is obtained by differential mode signal transmission. The time sequence and response capability required by the system can be easily achieved, thereby the probability of the system's misjudging or missing part of the data can be reduced. Therefore, in practice, when an edge connector is used to connect various interface cards and memory modules to the motherboard, each pair of conductors (generally referred to as
"contacts") on one side of the connector is mostly used to transmit signals under the differential mode.
Although better electrical characteristics of a connection system can be obtained by using differential mode signal transmission, the electrical characteristics of a pair of differential mode signals with opposite polarities is affected by the factors of the connector, such as the material and shape of the conductor, the arrangements of the conductors in relation to each other, as well as the arrangement of the conductors with the insulative material. Particularly, as computers and communication apparatus are getting smaller, the structure of the electronic connector also becomes more and more impact, e.g. with the distance between the conductors of the connector greatly reduced, and the density of the pins increased,. These changes, however, aggravates the problems related to signal transmission with high speed or high frequency, such as impedance, cross talk, propagation delay, attenuation, skew and rise time degradation. Therefore, obtaining desired performance of the system with a appropriate connectors has become a challenge to the industry.
Summary of the Invention
A purpose of the present invention is to provide a card connector for transmitting differential mode signals with a good electrical characteristic in an environment of high- 5 density pins and high-speed transmission environment.
In one embodiment, a connector for establishing electrical connection between a motherboard and a daughter board is provided. The connector has a housing and a plurality of electrically conductive terminals disposed in the housing. Each terminal has a l o connecting portion disposed along a first row and a second row defining a channel therebetween. An elongated electrical conductor such as a metal plate is attached to the housing and disposed in the channel.. The elongated electrical conductor can effectively reduce Far End Cross Talk (FEXT) level of the connector, as well as increase the strength and rigidity of the connector.
15
For a better understanding of the present invention and its purpose and preferred embodiments, further description accompanied by figures is provided in detail below.
Brief description of the drawings
Fig. IA is a perspective view of a connector according to one embodiment of the present invention;
Figs. IBand 1C are partially enlarged views of Fig. IA;
Fig. 2 is a perspective view showing the conductors of a connector of Fig. IA;
Figs. 3, 3B and 3C are perspective views showing the arrangements of the conductors of Fig. IA;
Fig. 4 is a perspective view showing the conductors of a connector according to another embodiment of the present invention;
Fig. 5 is a schematic chart showing far end cross talk test results of a connector according to one embodiment of the present invention, as compared to that of a conventional connector.
Detailed Description Of Preferred Embodiments
As shown in Figs. IA and 2, a card connector 1 includes a housing 20, a plurality pairs of first terminals 38, a plurality pairs of second terminals 39, and first and second elongated electrical conductor, such as metal plates 4a and 4b. Housing 20 has a slot 23 formed by a pair of walls 24 and 25, for receiving a circuit card such as a daughter board (not shown).
As shown in Figs. 2, 3 and 3A, the plurality pairs of first terminals 38 are disposed in housing 20. Each pair of the first terminals 38a, 38b has a contact portion 32c, 32a and a connection portion 32d, 32b. Connection portions 32d and 32b of the plurality pairs of first terminals 38 are bent from respective contact portions along a first direction 138.
As shown in Figs. 2, 3 and 3B, the plurality pairs of second terminals 39 are disposed in housing 20, in a manner staggered with respect to the plurality pairs of first terminals 38. Each pair of the second terminals 39a, 39b has a contact portion 36c, 36a and a connection portion 36d, 36b. Connection portions 36d and 36b of the plurality pairs of second terminals 38 are bent from respective contact portions along a second direction 139 which is opposite to first direction 138.
Connection portions 32, 36d, 32b, 36b form respective connection pin rows 52, 54, 56 and 58. Between first row 52 and second row 54 there is defined a first channel 70a. between third row C and fourth row D there is defined a second channel 70b. First and second plates 4a and 4b, made of electrically conductive material such as copper, are disposed in, but electrically insulated from, the respective first and second channels 70a and 70b, and fixed to housing 20. First and second plates 4a and 4b may extends over a partial or full length of channel 70a or 70b.
In one embodiment, first and second plates 4a and 4b are positioned such that when card connector 1 is attached to a PCB, there remains a gap between first and second plates 4a and 4b and the PCB, i.e. first and second plates 4a and 4b do not contact the PCB. As shown in Figs. IB and 1C, first and second plates 4a and 4b may have barbs 42 and/or projections 44 formed on the side walls. Recesses 242, 244 may also be provided in housing 20 for receiving barbs 42 and/or projections 44. When metal plate 4a and 4b are inserted into the housing, barbs 42, projections 44 and the corresponding housing portion may be deformed, so that metal plates 4a and 4b can be firmly fixed to housing 20. Alternatively, the groove or recess provided on housing 20 may be slightly narrower than the thickness of plates 4a and 4b, and plates 4a and 4b can be inserted and fixed into the groove or recess by interference fit.
Fig. 4 shows the conductors and metal plate structure of a card connector according to another embodiment of the invention. In this embodiment, conductors 38 and 39 form connection pin rows 52, 54, 56 and 58. Between second row 54 and third row 56, there is defined a third channel within which, a third plate 4c is disposed.
With one or more metal plates disposed between the conductor rows, a card connector can achieve a far-end cross talk performance improvement of about 1 to 2.5 db, when the connector is used for transmission of 2.0 - 4.0 GHz signals, compared to a conventional connector, as shown in Fig. 5. An added advantages is that, as the housing is made of insulative material and with the insertion of the metal place(s), the strength and rigidity of the housing is increased.
Although embodiments of the present invention have been illustrated in conjunction with the accompanying drawings and described in the foregoing detailed description, it should be appreciated that the invention is not limited to the embodiments disclosed. For example, although metal plates 4a, 4b and 4c are disclosed as examples, elongated electrical conductors with shapes other than a plate, e.g. a metal layer, a wire, a rod, a bar or the like, may be used. Therefore, the present invention should be understood to be capable of numerous rearrangements, modifications, alternatives and substitutions without departing from the spirit of the invention as set forth and recited by the following claims.

Claims

1. A card connector, comprising: a housing;
5 a plurality of electrically conductive terminals disposed in the housing, each terminal having a connecting portion, wherein connecting portions of the plurality of electrically conductive terminals being disposed along a first row and a second row defining a channel therebetween, and an elongated electrical conductor attached to the housing and disposed in the o channel.
2. The card connector of Claim 1, wherein the elongated electrical conductor extends over a full length of the channel. 5
3. The card connector of Claim 1 , wherein the housing has a pair of side walls and a slot between the pair of side walls, the connecting portions of the plurality of electrically conductive terminals are disposed along four rows parallel to each other defining three channels therebetween, wherein a first and a second channels are attached to the housing and disposed each under a side wall, and a first and a o second elongated electrical conductor are each disposed within a respective channel.
4. The card connector of Claim 3, wherein a center channel is disposed under the slot, and a third elongated electrical conductor is attached to the housing and disposed 5 within the center channel.
5. The card connector of Claim 1 , wherein the housing has a pair of side walls and a slot between the pair of side walls, the channel being under the slot, and the elongated electrical conductor being attached to the housing and disposed within0 the channel.
6. The card connector of Claim 1, wherein the housing has a groove for receiving the elongated electrical conductor, and the elongated electrical conductor has barbs formed on side surfaces thereof for securing to the groove.
7. The card connector of Claim 1 , wherein the housing has a groove for receiving the elongated electrical conductor, the groove has recesses on internal side walls, and the elongated electrical conductor has projections formed on side surfaces thereof for securing to the recesses.
8. The card connector of Claim 1 , wherein the housing has a groove for receiving the elongated electrical conductor, and the elongated electrical conductor has a thickness greater than am width of the groove.
PCT/EP2007/058658 2006-08-22 2007-08-21 Card connector with reduced fext WO2008023006A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TW095130831A TW200812159A (en) 2006-08-22 2006-08-22 Card connector
TW095130831 2006-08-22

Publications (1)

Publication Number Publication Date
WO2008023006A1 true WO2008023006A1 (en) 2008-02-28

Family

ID=38573324

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/058658 WO2008023006A1 (en) 2006-08-22 2007-08-21 Card connector with reduced fext

Country Status (2)

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TW (1) TW200812159A (en)
WO (1) WO2008023006A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010094007A1 (en) * 2009-02-16 2010-08-19 Molex Incorporated Co-edge connector
CN111129879A (en) * 2019-12-12 2020-05-08 昆山宏泽电子有限公司 Electric connector with high interference prevention function

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001057961A1 (en) * 2000-02-03 2001-08-09 Teradyne, Inc. Connector with shielding
US20030124879A1 (en) * 2001-12-28 2003-07-03 Ng Kiat-Hup Joey Electrical connector
US20050136739A1 (en) * 2003-12-23 2005-06-23 Milbrand Donald W.Jr. High speed connector assembly
US6939173B1 (en) * 1995-06-12 2005-09-06 Fci Americas Technology, Inc. Low cross talk and impedance controlled electrical connector with solder masses

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6939173B1 (en) * 1995-06-12 2005-09-06 Fci Americas Technology, Inc. Low cross talk and impedance controlled electrical connector with solder masses
WO2001057961A1 (en) * 2000-02-03 2001-08-09 Teradyne, Inc. Connector with shielding
US20030124879A1 (en) * 2001-12-28 2003-07-03 Ng Kiat-Hup Joey Electrical connector
US20050136739A1 (en) * 2003-12-23 2005-06-23 Milbrand Donald W.Jr. High speed connector assembly

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010094007A1 (en) * 2009-02-16 2010-08-19 Molex Incorporated Co-edge connector
US8795002B2 (en) 2009-02-16 2014-08-05 Molex Incorporated Co-edge connector
CN111129879A (en) * 2019-12-12 2020-05-08 昆山宏泽电子有限公司 Electric connector with high interference prevention function

Also Published As

Publication number Publication date
TW200812159A (en) 2008-03-01

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