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Title:
CONTACT ARRANGEMENT AND METHOD FOR REDUCING CROSS-TALK
Document Type and Number:
WIPO Patent Application WO/2017/042373
Kind Code:
A1
Abstract:
There is disclosed a contact arrangement (1) having a first contact element pair (10) for contacting a first pair (110) of signal lines (100) in a first connector (101) and having a second contact element pair (20) for contacting a second pair (120) of signal lines (100) in a second connector (102), wherein a second contact element (12) of the first contact element pair (10) and a first contact element (21) of the second contact element pair (20) are adjacent, wherein a first contact element (11) of the first contact element pair (10) is connected to the first contact element (21) of the second contact element pair (20) via an electrical arrangement (210) and the capacitance (Cy-1) of the electrical arrangement (210) corresponds to the capacitance (Cx-1) between the second contact element (12) of the first contact element pair (10) and the first contact element (21) of the second contact element pair (20). There is further disclosed a corresponding method. Cross-talk is minimised with such a solution.

Inventors:
BERGNER BERT (DE)
ALMEIDA CARLOS (DE)
Application Number:
PCT/EP2016/071381
Publication Date:
March 16, 2017
Filing Date:
September 09, 2016
Export Citation:
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Assignee:
TE CONNECTIVITY GERMANY GMBH (DE)
International Classes:
H01R12/72; H01R13/6464; H01R13/6466; H01R13/6463
Foreign References:
GB2343558A2000-05-10
EP2313948A12011-04-27
DE202012007577U12012-09-13
Other References:
PINOUTS.RU TEAM: "Ethernet 10 / 100 / 1000 Mbit RJ45 wiring diagram and cable pinout", 20 May 2014 (2014-05-20), XP055322819, Retrieved from the Internet [retrieved on 20161124]
Attorney, Agent or Firm:
KEANE, David (Scotland House165-169 Scotland Stree, Glasgow Strathclyde G5 8PL, GB)
Download PDF:
Claims:
Claims

A contact arrangement (1 ) having a first contact element pair (10) for contacting a first pair (1 10) of signal lines (100) in a first connector (101 ) and having a second contact element pair (20) for contacting a second pair (120) of signal lines (100) in a second connector (102), wherein a second contact element (12) of the first contact element pair (10) and a first contact element (21 ) of the second contact element pair (20) are adjacent, characterised in that a first contact element (1 1 ) of the first contact element pair (10) is connected to the first contact element (21 ) of the second contact element pair (20) via an electrical arrangement (210) and the capacitance (Cy-i) of the electrical arrangement (210) corresponds to the

capacitance (Cx-i) between the second contact element (12) of the first contact element pair (10) and the first contact element (21 ) of the second contact element pair (20).

The contact arrangement (1 ) according to Claim 1 , characterised in that the contact arrangement (1 ) comprises a printed circuit board (2) and the electrical

arrangement (210) comprises strip conductors (6) which are arranged on the printed circuit board (2).

The contact arrangement (1 ) according to either Claim 1 or Claim 2, characterised in that the electrical arrangement (210) comprises two plate portions (5) which are opposite each other.

The contact arrangement (1 ) according to Claim 3, characterised in that the contact elements (1 1 , 21 ) are constructed as punched components and the plate portions (5) are integral with the contact elements (1 1 , 21 ).

The contact arrangement (1 ) according to any one of Claims 1 to 4, characterised in that an extent direction (710) of the electrical arrangement (210) extends perpendicularly to an extent plane (71 1 , 712) of at least one contact element (1 1 , 12).

The contact arrangement (1 ) according to any one of Claims 1 to 5, characterised in that at least transmission portions (1 1 B, 12B) of the first contact element pair (10) are offset in an insertion direction (S) of the contact elements (1 1 , 12, 20, 21 ) at least relative to transmission portions (21 B, 22B) of the second contact element pair (20).

The contact arrangement (1 ) according to any one of Claims 1 to 6, characterised in that at least connection portions (1 1A, 12A) of the first contact element pair (10) are located in a first plane (701 ) and at least connection portions (21 A, 22A) of the second contact element pair (20) are located in a second plane (702) offset relative to the first plane.

The contact arrangement (1 ) according to any one of Claims 1 to 7, characterised in that the contact arrangement (1 ) comprises a third contact element pair (30) for contacting a third pair (130) of signal lines (100) in a third connector (103), wherein a first contact element (31 ) of the third contact element pair (30) and the second contact element (22) of the second contact element pair (20) are adjacent, wherein the contact arrangement (1 ) comprises a second electrical arrangement (220), via which the second contact element (22) of the second contact element (20) is connected to a second contact element (32) of the third contact element pair (30) and the capacitance (Cy2) of the second electrical arrangement (220) corresponds to the capacitance (Cx2) between the second contact element (22) of the second contact element pair (20) and the first contact element (31 ) of the third contact element pair (30).

The contact arrangement (1 ) according to Claim 8, characterised in that the contact arrangement (1 ) comprises a fourth contact element pair (40) for contacting a fourth pair (140) of signal lines (100) in a fourth connector (104), wherein a first contact element (41 ) of the fourth contact element pair (40) and the second contact element

(32) of the third contact element pair (30) are adjacent, wherein the contact arrangement (1 ) comprises a third electrical arrangement (230), via which the first contact element (31 ) of the third contact element pair (30) is connected to a first contact element (41 ) of the fourth contact element pair (40) and the capacitance (Cy3) of the third electrical arrangement (230) corresponds to the capacitance (Cx3) between the second contact element (32) of the third contact element pair (30) and the first contact element (41 ) of the fourth contact element pair (40).

10. A method for reducing cross-talk between a first pair (1 10) of signal lines (100) in a first connector (101 ) which is connected to a first contact element pair (10) in a contact arrangement (1 ) and a second pair (120) of signal lines (100) in a second connector (102) which is connected to a second contact element pair (20) in the contact arrangement (1 ), wherein a second contact element (12) of the first contact element pair (10) and a first contact element (21 ) of the second contact element pair (20) are adjacent, characterised in that a capacitance (Cyi) of an electrical arrangement (210) compensates for the capacitance (Cx-i) between the second contact element (12) of the first contact element pair (10) and the first contact element (21 ) of the second contact element pair (20).

Description:
Contact arrangement and method for reducing cross-talk

The invention relates to a contact arrangement having a first contact element pair for contacting a first pair of signal lines in a first connector and having a second contact element pair for contacting a second pair of signal lines in a second connector, wherein a second contact element of the first contact element pair and a first contact element of the second contact element pair are adjacent. The invention further relates to a method for reducing cross-talk between a first pair of signal lines in a first connector, which is connected to a first contact element pair in a contact arrangement, and a second pair of signal lines in a second connector, which is connected to a second contact element pair in the contact arrangement, wherein a second contact element of the first contact element pair and a first contact element of the second contact element pair are adjacent.

In order to screen the first contact element pair from the second contact element pair and thereby to prevent cross-talk, screening elements such as screening plates are generally fitted between the two contact element pairs. However, they take up space. The assembly is further difficult as a result of the assembly of such an additional element.

An object of the invention is to provide a solution in which the assembly is simple and in which the spatial requirement is small. This is achieved according to the invention for a contact arrangement in that a first contact element of the first contact element pair is connected to the first contact element of the second contact element pair via an electrical arrangement and the capacitance of the electrical arrangement corresponds to the capacitance between the second contact element of the first contact element pair and the first contact element of the second contact element pair. In a method according to the invention, a capacitance of an electrical arrangement compensates for the capacitance between the second contact element of the first contact element pair and the first contact element of the second contact element pair. In the solution according to the invention, the undesirable cross-talk which results from the first contact element of the second contact element pair with respect to the second contact element of the first contact element pair is compensated for by a second desirable cross-talk with respect to the first contact element of the first contact element pair because, as a result of the adaptation of the capacitances, the second cross-talk corresponds in terms of value to the first cross-talk and, when a signal is transmitted as a difference signal in the first contact element pair, consequently, only a shift of the two individual signals takes place, but not a change of the difference. Such a shift can readily be filtered out. Cross-talk is thereby effectively prevented.

The solution according to the invention can be further improved with the following embodiments and developments which are advantageous per se.

In an advantageous embodiment, the contact arrangement comprises a printed circuit board, wherein the electrical arrangement comprises strip conductors which are arranged on the printed circuit board. The compensation thereby takes place on the printed circuit board and a compensation in the connection region, for example, in a connector or a socket, is no longer necessary. As a result, for example, current connectors and sockets can continue to be used without additional modifications. Such strip conductors can further be readily produced. The compensation may also be carried out by other elements which are arranged on the printed circuit board, such as capacitors, if it is only desirable for current connectors or sockets to be able to be retained.

The electrical arrangement may comprise strip conductors which extend parallel with each other and which are not connected to each other and which constitute a capacitor. For example, two portions may be formed as fork-like members which are located one in the other. A capacitor which can be used for compensation is thereby readily produced.

In another advantageous embodiment, the electrical arrangement comprises two plate portions which are opposite each other. They can be used as a capacitor for producing the correct capacitance. Plate portions are simple to produce in this instance. In order to configure the production and assembly in a particularly simple manner, the contact elements may be punched components and the plate portions may be integral with the contact elements. The plate portions may be understood here to be portions of the contact elements or punched components. A complex assembly of the plate portions on the contact elements and/or a separate production can be dispensed with here.

In an advantageous embodiment, an extent direction of the electrical arrangement extends perpendicularly to an extent plane of at least one contact element. A coupling between the contact element and the electrical arrangement is thereby minimised. The extent direction of the electrical arrangement is preferably perpendicular to the extent planes of all the contact elements.

In order to decouple the first contact element pair from the second contact element pair more powerfully, at least transmission portions of the first contact element pair can be offset in an insertion direction of the contact elements relative to transmission portions of the second contact element pair. The transmission portions may in particular be portions which extend perpendicularly to the insertion direction. There is thereby achieved a greater spatial separation which reduces the coupling. If more than two contact element pairs are provided, the transmission portions of the contact element pairs can each be located alternately at the front and rear with respect to the insertion direction of the contact elements. The transmission portions can transmit, for example, signals from a connection portion of the contact elements to additional elements on a printed circuit board.

In another advantageous embodiment, a connection portion of the first contact element pair is located in a first plane and a connection portion of the second contact element pair is located in a second plane offset relative to the first plane. In this embodiment, a spatial separation is also increased and a coupling between the two contact element pairs is reduced. If, for example, the two contact element pairs are arranged on a printed circuit board, a portion of the first contact element pair may be further away from the printed circuit board than a portion of the second contact element pair. The portions may be located at different heights above the printed circuit board. The connection portions may be used, for example, to connect a connector.

If more than two contact element pairs are provided, the contact element pairs may each be located alternately in the first and second plane. In an advantageous embodiment, the contact arrangement comprises a third contact element pair for contacting a third pair of signal lines in a third connector, wherein a first contact element of the third contact element pair and the second contact element of the second contact element pair are adjacent, wherein the contact arrangement comprises a second electrical arrangement, via which the second contact element of the second contact element pair is connected to a second contact element of the third contact element pair and the capacitance of the second electrical arrangement corresponds to the capacitance between the second contact element of the second contact element pair and the first contact element of the third contact element pair. In such an embodiment, cross-talk between the second contact element pair and the third contact element pair is also prevented.

Similarly, additional contact element pairs and additional electrical arrangements may be present, wherein the electrical arrangements are each connected alternately once to the first contact elements of two adjacent contact element pairs and once to the second contact elements of two adjacent contact element pairs. With this embodiment, an effective decoupling of the different contact element pairs is possible.

The invention is explained in greater detail below by way of example with reference to advantageous embodiments and the drawings. The advantageous further developments and embodiments illustrated in this instance are each independent of each other and can be freely combined with each other, depending on how this is necessary in the application.

In the drawings:

Figure 1 shows a schematic perspective view of a contact arrangement together with a socket housing on a printed circuit board;

Figure 2 shows a schematic top view of a first embodiment of a contact arrangement according to the invention;

Figure 3 shows a schematic perspective view of a second embodiment of a contact arrangement according to the invention;

Figure 4 shows another schematic perspective view of the second embodiment according to Figure 3;

Figure 5 shows a top view of the second embodiment according to Figure 3;

Figure 6 shows another schematic perspective view of the second embodiment according to Figure 3 together with additional elements;

Figure 7 shows a schematic top view of a third embodiment of a contact arrangement according to the invention; and

Figure 8 shows a schematic front view of a fourth embodiment of a contact arrangement according to the invention.

Figure 1 illustrates a contact arrangement 1 together with a socket housing 3 arranged on a printed circuit board 2. The interior cannot yet be seen in detail in Figure 1. The contact arrangement illustrated in Figure 1 may contain, for example, the solution according to Figures 2 to 7 and serves to give an understanding of the environment of the invention.

The socket housing 3 has five connector receiving members 301 , 302, 303, 304, 305 for receiving five connectors 101 , 102, 103, 104, 105. The connectors 101 , 102, 103, 104, 105 are each connected to cables 4 which each comprise two signal lines 100. It is desirable from a construction point of view that a spacing 7 between adjacent pairs of signal lines 100, for example, between a first pair 1 10 and a second pair 120, should be as small as possible. At the same time, cross-talk is intended to be prevented. In previous solutions, screening plates are fitted between the individual signal pairs in order to prevent cross-talk. However, such a solution takes up space between the individual signal pairs. However, the solutions according to the invention are more space-saving than the previous solution.

Figure 2 shows a first embodiment of a solution according to the invention. The contact arrangement 1 shown comprises a first contact element pair 10 having a first contact element 1 1 and a second contact element 12 and a second contact element pair 20 having a first contact element 21 and a second contact element 22. Cross-talk occurs in particular between the adjacent contact elements 12 and 21 of the first contact element pair 10 or the second contact element pair 20. This may be attributed to the fact that these two contact elements 12, 21 constitute a type of capacitor having a first parasitic capacitance Cxi. This is illustrated in Figure 2 by a capacitor symbol. However, this illustration does not mean that an additional component would be present in this instance. It merely serves to provide a better understanding.

In order to compensate for the cross-talk which is caused by this first parasitic

capacitance Cxi , the first contact element 1 1 of the first contact element pair 10 is connected to the first contact element 21 of the second contact element pair 20 via an electrical arrangement 210, wherein the capacitance Cyi of this electrical arrangement 210 corresponds to the capacitance Cxi between the second contact element of the first contact element pair 10 and the first contact element 21 of the second contact element pair 20. If a signal is now transmitted in a differential form between the first contact element 1 1 and the second contact element 12 of the first contact element pair 10, the cross-talk caused by the first contact element 21 of the second contact element pair 20 occurs not only in the second contact element 12 of the first contact element pair 10, but also to the same extent in the first contact element 1 1 of the first contact element pair 10. The two voltages in the contact elements 1 1 and 12 are changed to the same extent so that the difference therebetween remains the same. Cross-talk is thereby compensated for.

In a similar manner, cross-talk is prevented between the second contact element pair 20 and the third contact element pair 30. To this end, the second contact element 22 of the second contact element pair 20 is connected to the second contact element 32 of the third contact element pair 30 via a second electrical arrangement 220, whose capacitance Cx 2 is adapted to the capacitance Cx 2 between the second contact element 22 of the second contact element pair 20 and the first contact element 31 of the third contact element pair 30 and thereby compensates for it. The cross-talk between the third contact element pair 30 and a fourth contact element pair 40 is also compensated for by means of a third electrical arrangement 230, wherein the connection is carried out in each case via the first contact elements 31 , 41 of the third contact element pair 30 or the fourth contact element pair 40. Similarly, the fourth contact element pair 40 and a fifth contact element pair 50 are connected via a fourth electrical arrangement 240, wherein the connection here, similarly to the case of the connection between the second and third contact element pairs 20, 30, is brought about with respect to the second contact elements 42 or 52, respectively. It is also possible for the contact arrangement 1 to comprise additional contact element pairs, wherein the connection is brought about alternately between the first contact elements of adjacent contact element pairs and the second contact elements of adjacent contact element pairs.

In the embodiment according to Figure 2, the electrical arrangement 210 comprises strip conductors 6 arranged between the first contact element pair 10 and the second contact element pair 20 on the printed circuit board 2. These strip conductors 6 extend partially parallel with each other and are spaced apart from each other. They are opposite each other and form a capacitor 60, whose capacitance is configured in such a manner that the entire capacitance Cyi of the electrical arrangement 210 is adapted to the capacitance Cxi between the second contact element 12 of the first contact element pair 10 and the first contact element 21 of the second contact element pair 20. The capacitance can be changed by the area of the overlap of the two portions of the strip conductors 6 extending parallel or the spacing between the two strip conductors 6 being increased or decreased.

The electrical arrangement 210 extends in an extent direction 710 which extends perpendicularly to extent planes 71 1 or 712 of the first contact element 1 1 or the second contact element 12 of the first contact element pair 10, respectively. A good decoupling between the contact elements 1 1 , 12 and the electrical arrangement 210 is thereby provided. The extent plane 71 1 of the contact element 1 1 is in this instance defined by a front portion 1 1A, the connection portion for connecting the cable 4 and a rear portion 1 1 B which extends perpendicularly thereto, the transmission portion of the contact element 1 1. Similarly, the extent plane 712 of the second contact element 12 is fixed.

Figures 3 to 6 illustrate a second embodiment of a contact arrangement 1 according to the invention. In this embodiment, the electrical arrangement 210 comprises two mutually opposing plate portions 5. A first plate portion 5 is integral with the first contact element 1 1 of the first contact element pair 10. A second plate portion 5 is integral with the first contact element 21 of the second contact element pair 20. These two plate portions 5 are each constructed to be planar, are opposite each other and extend partially parallel with each other so that they form a capacitor 60. The capacitance of this capacitor 60 can be adjusted by the spacing between the two plate portions 5 and the length of the overlap between the plate portions 5 so that the capacitance Cyi of the electrical arrangement 210 which connects the first contact element 1 1 of the first contact element pair 10 to the first contact element 21 of the second contact element pair 20 corresponds to the capacitance Cxi between the second contact element 12 of the first contact element pair 10 and the first contact element 21 of the second contact element pair 20.

The plate portions 5 are each integral with the contact elements 1 1 and 21 , respectively. They were punched from a metal sheet together with the contact elements 1 1 , 21. The combination of a contact element 1 1 , 21 and a plate portion 5 is a single punched component.

The electrical arrangements 210, 220, etc., again extend in an extent direction 710 which extends perpendicularly relative to the extent directions 71 1 , 712, etc., of the contact elements 1 1 , 12, etc., in order to achieve a good decoupling between the contact elements 1 1 , 12, etc., and the electrical arrangements 210, 220, etc.

Figure 7 illustrates another embodiment of a contact arrangement 1. In this instance, the transmission portions 1 1 B, 12B of the contact elements 1 1 , 12 of the first contact element pair 10 are offset relative to the transmission portions 21 B, 22B of the contact elements 21 , 22 of the second contact element pair 20 with respect to the insertion direction S. At least in those portions, the spacing between the two contact element pairs 10, 20, in particular the spacing between the second contact element 12 of the first contact element pair 10 and the second contact element 21 of the second contact element pair 20 is thereby increased without increasing a width of the contact arrangement 1 as measured in the width direction B. In this case, the width direction B extends perpendicularly to the insertion direction S and parallel with the direction of the printed circuit board 2. As a result of the increased spacing, the contact elements 12, 21 influence each other to a lesser extent. The transmission portions 1 1 B, 12B, 21 B, 22B extend in this instance perpendicularly to the insertion direction S. In another embodiment, they may also extend obliquely thereto or parallel therewith. Figure 7 further shows that the contact elements 1 1 , 12, 21 , 22 are received in corresponding, schematically illustrated receiving members 31 1 , 312, 321 , 322. From these receiving members 31 1 , 312, 321 or 322, the signal lines 100 extend away from contact arrangement 1 in a twisted manner in order to apply interference signals uniformly to the two signal lines 100.

Figure 8 shows another embodiment in which the connection portions 1 1 A, 12A, 31 A, 32A, 51 A, 52A of the contact elements 1 1 , 12, 31 , 32, 51 , 52 extend in a first plane 701. That first plane is parallel with the plane of the printed circuit board 2. The connection portions 21 A, 22A, 41 A, 42A of the contact elements 21 , 22, 41 , 42 are located in a second plane 702 which is parallel with the first plane 701 but is offset relative thereto. An increase of the spacing between portions of contact element pairs 10, 20, 30, 40, 50 which are adjacent in each case is also thereby achieved, for example, between the first contact element pair 10 and the second contact element pair 20, by means of which the coupling between the individual contact element pairs 10, 20, 30, 40, 50 is smaller.

List of reference numerals

1 Contact arrangement

2 Printed circuit board

3 Socket housing

4 Cable

5 Plate portions

6 Strip conductors

7 Spacing

10 First contact element pair

1 1 First contact element of the first contact element pair

1 1A Connection portion of 1 1

1 1 B Transmission portion of 1 1

12 Second contact element of the first contact element pair

12A Connection portion of 12

12B Transmission portion of 12

20 Second contact element pair

21 First contact element of the second contact element pair

21A Connection portion of 21

21 B Transmission portion of 21

22 Second contact element of the second contact element pair

22A Connection portion of 22

22B Transmission portion of 22

30 Third contact element pair

31 First contact element of the third contact element pair

31A Connection portion of 31

31 B Transmission portion of 31

32 Second contact element of the third contact element pair

32A Connection portion of 32

32B Transmission portion of 32

40 Fourth contact element pair

41 First contact element of the fourth contact element pair

41A Connection portion of 41

41 B Transmission portion of 41

42 Second contact element of the fourth contact element pair

42A Connection portion of 42

42B Transmission portion of 42 50 Fifth contact element pair

51 First contact element of the fifth contact element pair

51 A Connection portion of 51

51 B Transmission portion of 51

52 Second contact element of the fifth contact element pair

52A Connection portion of 52

52 B Transmission portion of 52

100 Signal line

101 First connector

102 Second connector

103 Third connector

104 Fourth connector

105 Fifth connector

1 10 First pair of signal lines

120 Second pair of signal lines

210 First electrical arrangement

220 Second electrical arrangement

230 Third electrical arrangement

240 Fourth electrical arrangement

301 Connector receiving member

302 Connector receiving member

303 Connector receiving member

304 Connector receiving member

305 Connector receiving member

31 1 Receiving member

312 Receiving member

321 Receiving member

322 Receiving member

701 First plane

702 Second plane

710 Extent direction

71 1 Extent plane

712 Extent plane

B Width

S Insertion direction

Cxi First parasitic capacitance Cx 2 Second parasitic capacitance

Cx 3 Third parasitic capacitance

Cx 4 Fourth parasitic capacitance

Cyi Capacitance of first electrical arrangement

Cy 2 Capacitance of second electrical arrangement

Cy 3 Capacitance of third electrical arrangement

Cy 4 Capacitance of fourth electrical arrangement