Methods and Apparatus for Reducing Crosstalk in Electrical Connectors

• US 20070117469A1
• Filed: 01/16/2007
• Published: 05/24/2007
• Est. Priority Date: 02/12/2004
• Status: Active Grant

• Current Assignee: Panduit Corporation
• Original Assignee: Panduit Corporation
• Inventors: Bolouri-Saransar, Masud, Caveney, Jack
• Granted Patent: US 7,452,246 B2
• Time in Patent Office: Days
• US Class Current: 439/676
• CPC Class Codes: H01R 13/6461 Means for preventing cross-talk
• 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 13/66 Structural association with built-in electrical component coupling devices having concentrically or coaxially-arranged contacts H01R24/38
• CPC Class Codes: H01R 13/6658 on printed circuit board H01R13/6666 - H01R13/6691 take precedence
• 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: H05K 1/162 incorporating printed capacitors
• CPC Class Codes: H05K 2201/09672 Superposed layout, i.e. in different planes
• CPC Class Codes: H05K 2201/10189 Non-printed connector
• CPC Class Codes: Y10S 439/941 Crosstalk suppression

Abstract

A communication jack having crosstalk compensation features for overall crosstalk interference reduction is disclosed. In one embodiment, the jack is configured to receive a plug to form a communication connection, and comprises jack contacts disposed in the jack, with each contact having at least a first surface and a second surface. Upon the plug being received by the jack, the plug contacts interface with the first surface of the jack contacts. The jack further includes a first capacitive coupling connected between two pairs of jack contacts to compensate for near end crosstalk, with the first capacitive coupling being connected to the pairs of jack contacts along the second surface adjacent to where the plug contacts interface with the jack contacts. A far end crosstalk compensation scheme is also set forth.

Claims

1. A crosstalk compensation apparatus for a jack/plug combination which includes a Far End Crosstalk (FEXT) zone wherein the net inductive and capacitive couplings are approximately equal in magnitude and of opposite polarity.

2. The crosstalk compensation apparatus of claim 1, wherein the net capacitive coupling includes both distributed and remote capacitive coupling.

3. The crosstalk compensation apparatus of claim 1, wherein the phase angle displacement from a plug/jack interface to the net inductive coupling of the FEXT zone is approximately equal to the phase angle displacement from the plug/jack interface to the net capacitive coupling of the FEXT zone.

4. The crosstalk compensation apparatus of claim 1, wherein the net capacitive coupling of the FEXT zone is of the same polarity as the net capacitance associated with the plug.

5. The crosstalk compensation apparatus of claim 1, wherein the FEXT zone is symmetric with respect to conductors connected directly to the plug and conductors connected directly to the jack.

6. The crosstalk compensation apparatus of claim 5, wherein the magnitudes of the inductive and capacitive couplings are equal and the polarities are opposite to minimize the FEXT zone effect on forward and reverse near end crosstalk.

7. A crosstalk compensation apparatus for a communication connector consisting of a jack and a plug, comprising a Far End Crosstalk (FEXT) zone which has virtually no effect on Near End Crosstalk (NEXT) but which reduces Far End Crosstalk (FEXT).