Electrical connector with improved crosstalk compensation

• US 7,153,168 B2
• Filed: 04/05/2005
• Issued: 12/26/2006
• Est. Priority Date: 04/06/2004
• Status: Active Grant

• Current Assignee: Panduit Corporation
• Original Assignee: Panduit Corporation
• Inventors: Bolouri-Saransar, Masud, Caveney, Jack E.
• Primary Examiner(s): NGUYEN, KHIEM M
• Application Number:
  US11/099,110
• Publication Number:
  US 20050277339A1
• Time in Patent Office: 630 Days
• Field of Search: 439/79, 439/620, 439/676, 439/941
• US Class Current: 439/676
• CPC Class Codes: H01R 13/6464 by adding capacitive elements
• CPC Class Codes: H01R 13/6466 on substrates, e.g. printed circuit boards [PCB]
• CPC Class Codes: H01R 13/719 specially adapted for high frequency, e.g. with filters
• CPC Class Codes: H01R 24/64 for high frequency, e.g. RJ 45
• CPC Class Codes: H05K 1/0228 Compensation of cross-talk by a mutually correlated lay-out of printed circuit traces, e.g. for compensation of cross-talk in mounted connectors balanced signal pairs H05K1/0245
• CPC Class Codes: Y10S 439/941 Crosstalk suppression

Abstract

An electrical connector with improved crosstalk compensation is disclosed. By including at least one coupling with a different frequency dependency than other couplings in the connector, crosstalk compensation performance is improved over a greater frequency range. The different frequency dependency may, for example, be used to compensate for phase shifts caused by distances between compensation circuitry and the plug/jack interface. Embodiments for decreasing these distances are also disclosed.

Claims

1. A communication jack comprising:

plug interface contacts for making electrical contact with plug contacts in a plug, the plug interface contacts and plug contacts introducing crosstalk having an associated first frequency dependency based on a frequency of a communication signal being communicated;

a plurality of crosstalk compensation zones, wherein at least one of the crosstalk compensation zones comprises a coupling having an associated second frequency dependency that substantially differs from the first frequency dependency.

2. The communication jack of claim 1, wherein the plurality of crosstalk compensation zones includes a first zone to provide crosstalk compensation and a second zone to introduce additional crosstalk.

3. The communication jack of claim 2, wherein, at a first frequency, the crosstalk introduced by the plug interface contacts and the plug contacts has an associated crosstalk vector, the first zone includes one or more couplings to provide a compensation vector, the additional crosstalk introduced by the second zone has an associated additional crosstalk vector, and the crosstalk vector is approximately equal in magnitude and opposite in polarity to the sum of the compensation vector and the additional crosstalk vector at a null frequency.

4. The communication jack of claim 3, wherein the crosstalk vector is approximately equal in magnitude and opposite in polarity to the sum of the compensation vector and the additional crosstalk vector at a second frequency that is substantially greater than the first frequency.

5. The communication jack of claim 1, wherein the first frequency dependency is a magnitude change of approximately 20 dB per decade, and wherein the second frequency dependency is a magnitude that changes from approximately 0 dB per decade at a first frequency to approximately 20 dB per decade at a second frequency.

6. The communication jack of claim 1, wherein the plurality of crosstalk compensation zones includes a first zone to provide crosstalk compensation, a second zone to introduce additional crosstalk, and a third zone to compensate for a phase shift of the first zone at high frequencies, wherein the first and second zones have approximately the first frequency dependency and wherein the third zone has approximately the associated second frequency dependency that substantially differs from the first frequency dependency.

7. The communication jack of claim 6, wherein, at a first frequency, the crosstalk introduced by the plug interface contacts and the plug contacts has an associated crosstalk vector |A|, the first zone includes one or more couplings to provide a compensation vector |B|, the additional crosstalk introduced by the second zone has an associated additional crosstalk vector |C|, and the third zone includes one or more couplings to provide a phase shift compensation vector |D|, and wherein, at a null frequency, |B|−

|D| approximately equals |A|+|C|.

8. The communication jack of claim 6, wherein the first frequency dependency is a magnitude change of approximately 20 dB per decade, and wherein the second frequency dependency is a magnitude that changes from approximately 0 dB per decade at a first frequency to approximately 20 dB per decade at a second frequency.

9. The communication jack of claim 1, wherein the plurality of crosstalk compensation zones includes a first zone to provide crosstalk compensation and a second zone to introduce additional crosstalk, wherein the second zone has approximately the first frequency dependency, and wherein the first zone has approximately the associated second frequency dependency that substantially differs from the first frequency dependency.

10. The communication jack of claim 9, wherein, at a first frequency, the crosstalk introduced by the plug interface contacts and the plug contacts has an associated crosstalk vector |A|, the first zone includes one or more couplings to provide a compensation vector |B|, and the additional crosstalk introduced by the second zone has an associated additional crosstalk vector |C|, and wherein, at a null frequency, |B| is selected to approximately equal |A|+|C|.

11. The communication jack of claim 9, wherein the first frequency dependency is a magnitude change of approximately 20 dB per decade, and wherein the second frequency dependency is a magnitude that changes from approximately 20 dB per decade at a first frequency to less than 20 dB per decade at a second frequency.

12. The communication jack of claim 9, wherein, at a first frequency, the crosstalk introduced by the plug interface contacts and the plug contacts has an associated crosstalk vector |A|, the first zone includes one or more couplings to provide a compensation vector |B|, and the additional crosstalk introduced by the second zone has an associated additional crosstalk vector |C|, and wherein, at a null frequency, |B| is selected to approximately equal |A|+|C|.

13. The communication jack of claim 12, wherein the second frequency dependency is a magnitude change of 20 dB per decade, and wherein the first frequency dependency is a magnitude that changes from approximately 20 dB per decade at a first frequency to greater than 25 dB per decade at a second frequency.

14. The communication jack of claim 1, wherein at least one of the crosstalk compensation zones comprises a capacitance placed in series with a mutual-inductive coupling.

15. The communication jack of claim 14, wherein the capacitance and mutual-inductive coupling are located at the opposite side of the plug-interface contacts from where the plug contacts electrically contact the plug interface contacts when the plug is inserted into the jack.

16. The communication jack of claim 1, wherein at least one of the crosstalk compensation zones comprises a capacitance that varies with frequency relative to other capacitances in the jack.

17. The communication jack of claim 1, wherein the capacitance has a permittivity that changes with frequency.

18. The communication jack of claim 1, wherein at least one of the crosstalk compensation zones comprises an inductance that varies with frequency relative to other inductances in the jack.

19. The communication jack of claim 18, wherein the inductance includes a ferrite material.

20. The communication jack of claim 1, wherein at least one of the crosstalk compensation zones comprises a capacitance in series with a frequency-dependent resistance.

21. The communication jack of claim 1, wherein at least one of the crosstalk compensation zones comprises a capacitance placed in series with a self-inductive coupling.

22. The communication jack of claim 1, wherein at least one of the crosstalk compensation zones is located less than approximately 0.200 inches from where the plug contacts electrically contact the plug interface contacts when the plug is inserted into the jack.

23. The communication jack of claim 1, further comprising first and second circuit boards, both in electrical contact with at least some of the plug interface contacts.

24. The communication jack of claim 23, wherein the plug interface contacts end in through-holes located in the first circuit board, and wherein the second circuit board is a flexible printed circuit mechanically and electrically connected to the plug interface contacts less than approximately 0.200 inches from where the plug contacts electrically contact the plug interface contacts when the plug is inserted into the jack.

25. The communication jack of claim 23, wherein the plug interface contacts end in through-holes located in the first circuit board, and wherein the second circuit board is a flexible printed circuit mechanically and electrically connected at the opposite side of the plug-interface contacts from where the plug contacts electrically contact the plug interface contacts when the plug is inserted into the jack.

26. The communication jack of claim 1, wherein at least one of the circuit boards is attached to the plug interface contacts by flexible members.

27. The communication jack of claim 26, wherein the flexible members attach to all but two of the plug interface contacts.

28. A communication jack for communicating a signal, comprising:

a first crosstalk compensation zone for offsetting crosstalk;

a second crosstalk compensation zone to provide additional compensation to offset a phase-shift effect; and

a third crosstalk compensation zone to provide crosstalk compensation that adjusts with frequency of the signal.