Modular jack connector with offset circuitry for controlled capacitance compensation

• US 10,424,874 B2
• Filed: 04/26/2018
• Issued: 09/24/2019
• Est. Priority Date: 11/11/2015
• Status: Active Grant

• Current Assignee: Bel Fuse Limited (Bel Fuse)
• Original Assignee: Bel Fuse Limited (Bel Fuse)
• Inventors: Belopolsky, Yakov, Baum, Andrew David, Gutter, David Henry, Imschweiler, Derek, Marowsky, Richard D.
• Primary Examiner(s): Hyeon, Hae Moon
• Assistant Examiner(s): Leigh, Peter G
• Application Number:
  US15/963,765
• Publication Number:
  US 20180248318A1
• Time in Patent Office: 516 Days
• Field of Search: 439 78, 439676
• CPC Class Codes: H01R 13/6469 on substrates
• CPC Class Codes: H01R 13/6594 the shield being mounted on a PCB and connected to conductive members
• CPC Class Codes: H01R 2107/00 Four or more poles
• CPC Class Codes: H01R 24/64 for high frequency, e.g. RJ 45

Abstract

A modular jack connector compensates for plug characteristics via a controlled primary compensation in the immediate vicinity of the connector interface. A jack contact assembly is positioned within a jack housing and includes first and second sets of elongate contacts each having a plug contact portion and a signal output portion. Each elongate contact is configured such that their respective plug contact portions are coplanar and a signal path is defined between their plug contact portions and their signal output portions. A flexible circuit board is coupled proximate to the plug contact portions, and configured to provide capacitance compensation between respective contacts engaged thereby, wherein the capacitance compensation is offset from a signal path defined between the plug contact portions and the corresponding signal output portions.

Claims

1. A network interface connector, comprising:

a jack housing;

a rigid printed circuit board (PCB);

a jack contact assembly positioned within the jack housing and further comprising a plurality of elongate contacts each having a plug contact engagement portion and a PCB mounting portion,

wherein each of the elongate contacts are configured such that a signal path is defined between their respective plug contact engagement portion and PCB mounting portion, and each of the plug contact engagement portions for the plurality of elongate contacts are substantially coplanar with respect to each other; and

one or more flexible circuit boards (FCBs) coupled to each of the plurality of elongate contacts via respective FCB mounting portions and offset from the signal path,

wherein the one or more FCBs comprise a flexible substrate with at least first and second copper layers on opposing sides thereof and configured to provide a controlled capacitance compensation between respective contacts engaged thereby and offset from the defined signal paths,

wherein a value of the controlled capacitance is based on a controlled dielectric constant and thickness of the flexible substrate further in view of an overlapping area of first and second copper plates respectively associated with the first and second copper layers, and

the controlled capacitance in the one or more FCBs effectively cancels resident capacitance between adjacent plug contacts coupled to the jack contact assembly.

2. The network interface connector of claim 1, wherein each of the elongate contacts have first and second opposing ends corresponding to the plug contact engagement portion and the PCB mounting portion, respectively, and the FCB mounting portion further comprises an interconnecting branch extending from a middle portion of the contact.

3. The network interface connector of claim 2, wherein each elongate contact including the associated FCB mounting portion is integrally formed from a single base material.

4. The network interface connector of claim 3, wherein the FCB mounting portion for one or more of the elongate contacts is sheared from a central area of the middle portion of the elongate contact and extended outward to form the respective interconnecting branch.

5. The network interface connector of claim 1, wherein each of the elongate contacts have first and second opposing ends corresponding to the PCB mounting portion and the FCB mounting portion, respectively, and the plug contact engagement portion further comprises a middle portion of the contact.

6. The network interface connector of claim 5, wherein the plurality of elongate contacts comprise first and second outer contacts and a plurality of inner contacts, wherein the first and second outer contacts are longer than the plurality of inner contacts and configured to initiate engagement with respective mating plug contacts and guide said mating plug into further engagement with the inner contacts.

7. The network interface connector of claim 1, wherein each of the elongate contacts comprise first and second members, each of the first and second members having adjacent first ends as the PCB mounting portion, the first member having a second end pivoted from the second member and defining the FCB mounting portion, the second member being longer than the first member and defining the plug contact engagement portion.

8. The network interface connector of claim 1, wherein each of the elongate contacts have first and second opposing ends corresponding to the plug contact engagement portion and the PCB mounting portion, respectively, and the FCB mounting portion further comprises a middle portion of the contact.

9. The network interface connector of claim 8, wherein the flexible substrate for each FCB is flexed into an arcuate configuration about a central axis coupled to the FCB mounting portion of a respective elongate contact, the flexible substrate further comprising first and second copper layers applied on opposing sides of the central axis.

10. The network interface connector of claim 1, wherein the first copper plate is smaller than and enveloped with respect to the second copper plate.

11. The network interface connector of claim 1, further comprising at least one contact alignment member receiving each of the elongate contacts there through.

12. The network interface connector of claim 11, wherein the at least one contact alignment member is molded over the elongate contacts and formed of an insulating material.

13. The network interface connector of claim 11, wherein each of the elongate contacts are coupled to the at least one contact alignment member between their respective plug contact and signal output portions.

14. The network interface connector of claim 11, further comprising an electrically isolated compression spring mounted between an internal wall of the jack housing and the at least one contact alignment member, and configured to apply a normal force to the contact assembly.

15. The network interface connector of claim 1, wherein the PCB mounting portions of a first set of elongate contacts are maintained in a first coplanar array, and the PCB mounting portions of a second set of elongate contacts are maintained in a second coplanar array parallel to the first coplanar array.

16. The network interface connector of claim 1, further comprising an insulating contact guide frame surrounding the elongate contacts and having embedded protective slots configured to receive the elongate contacts and ribs extending from the contact guide frame to engage and guide plug contacts during an insertion process.

17. The network interface connector of claim 1, further comprising a jack shield encapsulating the jack housing and further providing an electrical ground path between the rigid PCB and a plug connector when engaging the jack contact assembly.

18. The network interface connector of claim 1, wherein the FCB mounting portions for the respective contacts are configured such that the controlled capacitance compensation between respective contacts is provided in immediate proximity with a jack-plug interface.

19. A network interface connector, comprising:

a jack housing;

a rigid printed circuit board (PCB);

a jack contact assembly positioned within the jack housing and further comprising a plurality of elongate contacts each having a plug contact engagement portion and a PCB mounting portion;

wherein each of the elongate contacts are configured such that a signal path is defined between their respective plug contact engagement portion and PCB mounting portion, and each of the plug contact engagement portions for the plurality of elongate contacts are substantially coplanar with respect to each other;

at least one contact alignment member receiving each of the elongate contacts there through, wherein each of the elongate contacts are coupled to the at least one contact alignment member between their respective plug contact and signal output portions, and

one or more flexible circuit boards (FCBs) coupled to each of the plurality of elongate contacts via respective FCB mounting portions and offset from the signal path,

wherein the one or more FCBs comprise a flexible substrate with at least first and second copper layers on opposing sides thereof and configured to provide a controlled capacitance compensation between respective contacts engaged thereby and offset from the defined signal paths.

20. The network interface connector of claim 19, wherein the FCB mounting portions for the respective contacts are configured such that the controlled capacitance compensation between respective contacts is provided in immediate proximity with a jack-plug interface.