CA2311802A1 - A method of reducing high frequency coupling between pairs of conductors in a connector, and a connector for transferring differential signals - Google Patents

A method of reducing high frequency coupling between pairs of conductors in a connector, and a connector for transferring differential signals Download PDF

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Publication number
CA2311802A1
CA2311802A1 CA002311802A CA2311802A CA2311802A1 CA 2311802 A1 CA2311802 A1 CA 2311802A1 CA 002311802 A CA002311802 A CA 002311802A CA 2311802 A CA2311802 A CA 2311802A CA 2311802 A1 CA2311802 A1 CA 2311802A1
Authority
CA
Canada
Prior art keywords
conductors
dielectric
connector
pairs
connecting conductors
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
CA002311802A
Other languages
French (fr)
Inventor
Masud Bolouri-Saransar
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LK AS
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2311802A1 publication Critical patent/CA2311802A1/en
Abandoned legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00Printed circuits
    • H05K1/02Details
    • H05K1/0213Electrical arrangements not otherwise provided for
    • H05K1/0216Reduction of cross-talk, noise or electromagnetic interference
    • H05K1/0228Compensation of cross-talk by a mutually correlated lay-out of printed circuit traces, e.g. for compensation of cross-talk in mounted connectors
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/646Details 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
    • H01R13/6461Means for preventing cross-talk
    • H01R13/6471Means for preventing cross-talk by special arrangement of ground and signal conductors, e.g. GSGS [Ground-Signal-Ground-Signal]
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/648Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding  
    • H01R13/658High frequency shielding arrangements, e.g. against EMI [Electro-Magnetic Interference] or EMP [Electro-Magnetic Pulse]
    • H01R13/6598Shield material
    • H01R13/6599Dielectric material made conductive, e.g. plastic material coated with metal
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00Printed circuits
    • H05K1/02Details
    • H05K1/0213Electrical arrangements not otherwise provided for
    • H05K1/0216Reduction of cross-talk, noise or electromagnetic interference
    • H05K1/0218Reduction of cross-talk, noise or electromagnetic interference by printed shielding conductors, ground planes or power plane
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/646Details 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
    • H01R13/6473Impedance matching
    • H01R13/6477Impedance matching by variation of dielectric properties
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00Printed circuits
    • H05K1/02Details
    • H05K1/0213Electrical arrangements not otherwise provided for
    • H05K1/0216Reduction of cross-talk, noise or electromagnetic interference
    • H05K1/0218Reduction of cross-talk, noise or electromagnetic interference by printed shielding conductors, ground planes or power plane
    • H05K1/0219Printed shielding conductors for shielding around or between signal conductors, e.g. coplanar or coaxial printed shielding conductors
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00Printed circuits
    • H05K1/02Details
    • H05K1/11Printed elements for providing electric connections to or between printed circuits
    • H05K1/118Printed elements for providing electric connections to or between printed circuits specially for flexible printed circuits, e.g. using folded portions
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09Shape and layout
    • H05K2201/09209Shape and layout details of conductors
    • H05K2201/09218Conductive traces
    • H05K2201/09236Parallel layout

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)

Abstract

In order to reduce high frequency signal coupling between conductors in pairs in connectors (1, 2), said conductors consisting of connecting conductors in pairs (A+, A-; B+, B-; C+, C-; D+, D-), which are embedded in a dielectric (14), and contact springs, two layers are provided on the sides of the contact springs which are not to touch other contact springs, the first layer being a dielectric, the second layer being an electrically conductive shield (13).
Furthermore, the dielectric, which surrounds the connecting conductors, is partially replaced by electrically conductive shields. A reduction in signal coupling between two sets of conductors in pairs may be obtained hereby.

Description

A method of reducing high frequency coupling between pairs of conductors in a connector, and a connector for transferring differential signals The invention relates to a method of reducing undesired high frequency signal coupling in a connector which is used for the transfer of balanced signals through several conductors in pairs, said connector having connecting 10 conductors to connect contact springs and terminals, said pairs of connecting conductors being arranged in a di-electric.
Connectors of the above-mentioned type are usually used 15 in the transmission of data at high rates. These connec-tors consist of terminals at one end which may be con-nected to a cable, a printed circuit board or the like. A
connecting element extends from the terminals, consisting of a number of conductors in pairs which may be arranged 20 in a dielectric. A plurality of contact springs corre-sponding to the plurality of connecting conductors is ar-ranged at the opposite end of the conductors. The contact springs are intended to make contact with another connec-tor. As the contact springs are usually very closely 25 spaced, it is inevitable that a certain coupling occurs between the conductors in pairs, understood in the way that when data are transferred through the conductors, they will cause so-called crosstalk, which means that signals from one set of conductors may be recognized in 30 reduced form in another set of conductors. Further, there will be a certain coupling between the conductors in the connecting element itself.
With the ever increasing miniaturization of connectors 35 for use in the transfer of data, the distances between the conductors in the connectors get smaller, which means
2 that the coupling between the conductors in pairs gets even more pronounced.
The patent literature describes many different ways of 5 eliminating crosstalk between pairs of electrical conduc-tors in connectors of the above-mentioned type, and even though the prior art approaches have succeeded in provid-ing a good reduction, further reduction of crosstalk is sti.Il needed.

Accordingly, an object of the invention is to provide a method and a connector by means of which the reduction of crosstalk between pairs of conductors in a connector is even stronger than the reduction obtainable by the prior 15 art.
The object of the invention is achieved by a method of the type defined in the introductory portion of claim 1 which is characterized in that at least some of the pairs 20 of contact springs are coated by a dielectric, and that the dielectric is coated with a shielding material.
Noise contributions from other pairs of the conductors in the connector will hereby be reduced optimally.

To enhance the effect of the reduction additionally, the method may be characterized in that all free surfaces of the contact springs are coated with 2 layers consisting of a layer of dielectric material on whose surfaces a 30 layer of electrically shielding material is applied, as stated in claim 2.
To ensure the noise reduction between the pairs of con-ductors in the connector additionally, it is an advan-35 tage, as stated in claim 4, that an electrical shield is WO 991303$8 PCT/DK98/00528
3 provided on each side of a pair of connecting conductors in substitution for a portion of the dielectric.
The combination of shield/dielectric gives a better re-5 duction of undesirable signal transfer between the pairs of conductors than if there is just a dielectric around the connecting conductors.
As mentioned, the invention also relates to a connector 10 which, as stated in claim 5, may be of the male or female plug type for the transfer of differential signals through several conductors in pairs, said connector hav ing connecting conductors to connect contact springs and terminals, said connecting conductors being arranged in a 15 dielectric.
The connector is characterized in that a dielectric layer is provided on the upper side of at least some of the contact springs, and that an electrical shield is addi-20 tionally provided on the upper side of the dielectric layer.
This provides a connector in which the crosstalk between the pairs of connectors may be reduced considerably even 25 at very high rates.
To reduce crosstalk in the connector additionally, all the sides of the contact springs which do not make elec-trical contact with a connected connector may be coated 30 with a dielectric, which is additionally coated with a conductive shield, as stated in claim 6.
As stated in claim 7, it is an advantage that electrical shields are provided in parts of the dielectric of the 35 connecting conductors.
4 The combination of dielectric and electrically conductive shields gives a greater immunity between the pairs.
Particularly expediently, as stated in claim 8, the elec-
5 trical conductors are embedded on each side of the di-electric of a pair of the connecting conductors.
It is ensured hereby that signals in a pair of signals are shielded very strongly from surrounding other pairs 10 of signals, even when they are physically very close to each other.
Finally, as stated in claim 9, it is an advantage if the entire surface of the dielectrics positioned to the 15 greatest extent possible around all the connecting con-ductors is coated with an electrically conductive shield.
This provides the maximum reduction in crosstalk between the pairs of electrical conductors and reduction in in-20 terference from external signals.
The invention will now be explained more fully with ref-erence to an example shown in the drawing, in which 25 fig. 1 shows an ordinary plug connection in which two connectors are connected to their respective cables, fig. 2 shows a typical structure of conductors in pairs in a connector, e.g. a connector as shown in fig. 1, fig. 3 shows an equivalent circuit diagram of the elec-trical conditions in the reduction of crosstalk in a con-nector, 35 fig. 4 schematically shows the conductors whose crosstalk is preferably to be reduced most, WO 9913038$ PCT/DK98100528 fig. 5 shows the connecting conductor constructed with the constructive features according to the invention, 5 fig. 6 in more detail shows another embodiment of the connecting conductor in cross-section constructed with the constructive features according to the invention, fig. 7 shows the contact springs with the constructive features according to the invention, and fig. 8 shows an alternative embodiment of the structure of the contact spring part.
15 Fig. 1 shows two connectors which are designated 1 and 2, respectively. These connectors 1, 2 each have a cable 3 connected at their ends, and contact springs are provided at their opposite ends for connection of the two connec-tors 1 and 2.
Fig. 2 shows a connector 1 having eight conductors which consist of four pairs of conductors. These pairs of con-ductors are used for transferring balanced differential signals. To facilitate the understanding of the inven-25 tion, the two poles of the pair of conductors A are des-ignated A+ and A_in fig. 2. Similarly, the other pairs of conductors are designated B,., B-, C+, C_, and D+, D_. It is noted that the pair of conductors D is spaced more from each other than the other pairs of conductors, as the 30 pair of conductors B has poles which are positioned within the two poles of the pair of conductors D.
Fig. 3 shows an equivalent circuit diagram, with the measures which have been taken in order to reduce cross-35 talk between pairs of conductors.
6 In the figure, 6 designates an area which schematically shows how terminals, which may e.g. be terminals for con-nection to a printed circuit board, are interconnected by capacitors 9 with a view to reducing crosstalk between 5 the individual conductors in the terminal area. This is shown by a technique known per se, which will therefore not be explained more fully here.
7 designates an area which illustrates reduction of 10 crosstalk in the connecting conductor area of a connec-tor. By way of example, it is schematically shown at 10, 11 and 12 how reduction of crosstalk between pairs of conductors in the area 7 is provided, as 10, 11 and 12 symbolize the constructive features according to the in-15 vention for reducing crosstalk in the area 7.
Fig. 3 additionally shows an area 8 which illustrates how reduction of crosstalk between the individual conductors in a connector in the contact spring area is provided, 20 here shown schematically by the reference numeral 13.
Fig. 4 shows the structure of pairs of connectors in a connector as shown in figs. 1 and 2. These pairs of con-nectors are intended to transfer data at high rates. The 25 rates are not necessarily the same for all the pairs of conductors.
Fig. 5 shows the connecting conductors which are embedded in a dielectric designated 14. As will additionally be 30 seen in fig. 4, 13 designates electrical shields which, as shown in the figure, are arranged between the pairs of conductors as well as on the upper side and the lower side of the dielectric positioned above and below the conductors. This results in a strong shielding in the 35 connecting conductor area by means of common earth be-tween the conductors in pairs.

WO 99130388 PCT/DK981rD0528 In fig. 6, 15 designates a dielectric in a connecting conductor area in a connector. As will be seen, the pairs of conductors A+, A_..., Dt, D_ recur in this figure. The 5 dielectric 15 is divided and defined by several metal-lized surfaces, shown at the reference numeral 18. Addi-tionally, a co-extensive metal foil 16 is provided on the outer side of the surface 18, and may also be provided on the lower side, but not shown in fig. 6. The subareas of 10 the divided dielectric are shown in fig. 6 at the refer-ence numerals 15A, 15B, 15C, 15D and 15E. As will be seen, the pair of conductors A., A is defined by a metal-lized subarea 15A, except at the small areas shown at 21 and 22, which are necessary to avoid short-circuits be-15 tween the metallized surfaces 15B, etc., of the respec-tive areas, since short-circuits may cause an increase in crosstalk. As will additionally be seen, a conductor or a pair of conductors is arranged in each of the areas 15A, 15B, 15C, 15D and 15E, and this conductor or pair of con-20 ductors is protected against mutual interference in the form of crosstalk because of the provision of the metal-lized surfaces. In other words, the crosstalk between e.g. the pair of conductors B., B_ and D_, or D. is re-duced.

Fig. 7 schematically shows how the pairs of conductors in the contact spring area are shielded. This takes place by coating one side of the conductor with a dielectric 14 on whose surface a conductor material 13 has additionally 30 been applied.
The opposite end of the connector is used for making con-tact with a conductor in another connector.
35 Fig. 8 shows an alternative embodiment for the implemen-tation of the principles of the invention according to
8 PCTIDK98/OOS28 fig. 7, the difference with respect to the embodiment in fig. 7 being that also a shield 13 is arranged on the sides of the dielectric which adjoins the conductors A-D.
5 Although the principles of the invention have been ex-plained in connection with a connector having four pairs of conductors, nothing, of course, prevents the prin-ciples of the invention from being used in connection with other types of conductors where the conductors may 10 be positioned in another manner than shown in the fig-ures. For example, the conductors may be staggered with respect to each other, and moreover connectors having pairs of conductors formed by more than four conductors are conceivable.

Claims (9)

Claims:
1. A method of reducing undesirable high frequency signal coupling in a connector (1, 2) which is used for the transfer of balanced signals through several conductors in pairs (A+. A-; B+, B-; C+, C-; D+, D-) , said connector having connecting conductors to connect contact springs and terminals, said pairs of connecting conductors being arranged in a dielectric (14), characterized in that at least some of the contact spring parts of the pairs are coated with a dielectric (14), and that the di-electric is coated with an electrically shielding material (13).
2. A method according to claim 1, characterized in that all free surfaces of the contact springs are coated with 2 layers consisting of a layer of dielectric material (14) on whose surfaces a layer of electrically shielding material is applied.
3. A method according to claim 1 or 2, characterized in that at least parts of the dielectric in some of the pairs in the connecting conductors are replaced by an electrical shield (13) which is incorporated as common earth.
4. A method according to claim 3, characterized in that an electrical shield is provided on each side of a pair of connecting conductors in substitution for dielectric.
5. A connector (1, 2) of the male or female plug type for the transfer of differential signals through several conductors in pairs (A+, A-; B+, B-; C+. C-; D+, D-), said connector having connecting conductors to connect contact springs and terminals, sad connecting conductors being arranged in a dielectric, characterized in that a dielectric layer (14) is provided on the upper side of at least some of the contact springs, and that an electrical shield (13) is additionally provided on the upper side of the dielectric layer.
6. A connector according to claim 5, characterized in that all the sides of the contact springs which do not make electrical contact with a connected connector are coated with a dielectric, which is additionally coated with an electrically conductive shield.
7. A connector according to claim 5, characterized in that electrical shields are provided in parts of the dielectric of the connecting conductors.
8. A connector according to claim 7, characterized in that the electrical shields are embedded on each side of the dielectric of a pair of the connecting conductors.
9. A connector according to any one of claims 5-8, characterized in that the entire surface of the dielectrics positioned above and below all the connecting conductors is coated with an electrically conductive shield.
CA002311802A 1997-12-05 1998-12-04 A method of reducing high frequency coupling between pairs of conductors in a connector, and a connector for transferring differential signals Abandoned CA2311802A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DK141097 1997-12-05
DK1410/97 1997-12-05
PCT/DK1998/000528 WO1999030388A1 (en) 1997-12-05 1998-12-04 A method of reducing high frequency coupling between pairs of conductors in a connector, and a connector for transferring differential signals

Publications (1)

Publication Number Publication Date
CA2311802A1 true CA2311802A1 (en) 1999-06-17

Family

ID=8104536

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002311802A Abandoned CA2311802A1 (en) 1997-12-05 1998-12-04 A method of reducing high frequency coupling between pairs of conductors in a connector, and a connector for transferring differential signals

Country Status (4)

Country Link
EP (1) EP1036427A1 (en)
AU (1) AU1483199A (en)
CA (1) CA2311802A1 (en)
WO (1) WO1999030388A1 (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MXPA02000940A (en) * 1999-07-27 2002-10-23 Siemon Co Shielded telecommunications connector.
US6506077B2 (en) 2000-07-21 2003-01-14 The Siemon Company Shielded telecommunications connector
US7182649B2 (en) 2003-12-22 2007-02-27 Panduit Corp. Inductive and capacitive coupling balancing electrical connector
US7179131B2 (en) 2004-02-12 2007-02-20 Panduit Corp. Methods and apparatus for reducing crosstalk in electrical connectors
CN102082367B (en) 2004-03-12 2013-11-20 泛达公司 Methods and apparatus for reducing crosstalk in electrical connectors
US7153168B2 (en) 2004-04-06 2006-12-26 Panduit Corp. Electrical connector with improved crosstalk compensation
EP2675022B1 (en) 2004-07-13 2014-09-03 Panduit Corporation Communications connector with flexible printed circuit board
US7866337B2 (en) 2005-07-08 2011-01-11 Entegris, Inc. Chemically inert flow controller with non-contaminating body
JP2009527079A (en) 2006-02-13 2009-07-23 パンデュイット・コーポレーション Connector with crosstalk compensation function
US7874878B2 (en) 2007-03-20 2011-01-25 Panduit Corp. Plug/jack system having PCB with lattice network
WO2017100114A1 (en) 2015-12-08 2017-06-15 Panduit Corp. Rj45 shuttered jacks and related communication systems

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986005311A1 (en) * 1985-03-04 1986-09-12 Amp Incorporated High performance flat cable
US5094623A (en) * 1991-04-30 1992-03-10 Thomas & Betts Corporation Controlled impedance electrical connector
US5262353A (en) * 1992-02-03 1993-11-16 Motorola, Inc. Process for forming a structure which electrically shields conductors
US5186647A (en) * 1992-02-24 1993-02-16 At&T Bell Laboratories High frequency electrical connector
US5296651A (en) * 1993-02-09 1994-03-22 Hewlett-Packard Company Flexible circuit with ground plane
US5470244A (en) * 1993-10-05 1995-11-28 Thomas & Betts Corporation Electrical connector having reduced cross-talk
US5628647A (en) * 1995-02-22 1997-05-13 Stewart Connector Systems, Inc. High frequency modular plug and cable assembly

Also Published As

Publication number Publication date
WO1999030388A1 (en) 1999-06-17
AU1483199A (en) 1999-06-28
EP1036427A1 (en) 2000-09-20

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FZDE Discontinued