Modular jack connector with a flexible laminate capacitor mounted on a circuit board

• US 5,736,910 A
• Filed: 11/22/1995
• Issued: 04/07/1998
• Est. Priority Date: 11/22/1995
• Status: Expired due to Term

• Current Assignee: Bel Fuse Macau Commercial Offshore Limited (Bel Fuse)
• Original Assignee: Stewart Connector Systems, Inc. (Bel Connector Incorporated)
• Inventors: Hatch, David, McClune, Don, Brennan, Robert J., Meckley, Ted R., Townsend, Peter K.
• Primary Examiner(s): Pascal, Robert
• Assistant Examiner(s): Bettendorf, Justin P.
• Application Number:
  US08/561,931
• Time in Patent Office: 867 Days
• Field of Search: 333/172, 333/181, 333/182, 333/183, 333/184, 333/185, 361/301.1, 361/301.2, 361/301.3, 361/301.4, 361/301.5, 439/620
• US Class Current: 333/181
• CPC Class Codes: H01R 12/59 for flexible printed circuits, flat or ribbon cables or like structures
• CPC Class Codes: H01R 13/6625 with capacitive component
• CPC Class Codes: H01R 13/6633 with inductive component, e.g. transformer
• 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

Abstract

A modular jack connector mounted on a main printed circuit board and having a receptacle into which a modular plug of an electronic component is inserted. The connector includes a housing, a first set of contacts arranged in the housing each adapted to engage one of the contacts of the plug, a second set of contacts at least partially arranged in the housing and adapted to engaging the main printed circuit board, contact coupling circuit means for electrically coupling the first and second sets of contacts, a capacitor for providing impedance to high frequency noise and interference and a metallic shield at least partially surrounding the housing and connected to a grounding region on the main printed circuit board. In one embodiment, the capacitor is a flexible laminate assembly including first and second conductive sheet members and an intermediate insulative material. Further, the capacitor has a plurality of folded pleats including a first pleat arranged at one end of the laminate assembly and a second pleat arranged at an opposite end of the laminate assembly. The first conductive sheet member is electrically coupled at the first pleat to the contact coupling circuit means, and the second conductive sheet member is electrically coupled at the second pleat to the metallic shield to thereby ground the first set of contacts through the capacitor. The contact coupling circuit means may include toroidal coil pairs which function separately as either a differential mode filter or a common mode filter.

Claims

1. A modular connector for mounting on a main printed circuit board and for receiving a plug, comprising

a housing,

a first set of contacts arranged in said housing each adapted to engage one of the contacts of the plug,

a second set of contacts at least partially arranged in said housing and adapted to engage the main printed circuit board,

a contact coupling printed circuit board for electrically coupling said first and second sets of contacts, said contact coupling printed circuit board providing a signal path between respective ones of the first and second sets of contacts,

a capacitor comprising a flexible laminate assembly including first and second flexible conductive sheet members and an intermediate insulative material, said first conductive sheet member being electrically coupled to said contact coupling printed circuit board, and

a metallic shield at least partially surrounding said housing for connecting to a grounding region on the main printed circuit board, said second conductive sheet member being electrically coupled to said metallic shield to thereby ground said first set of contacts through said capacitor.

2. The connector of claim 1, wherein said contact coupling printed circuit board is arranged in said housing, said first and second sets of contacts being connected to said contact coupling printed circuit board, and further including

a plurality of toroidal coil pairs mounted on said contact coupling printed circuit board and coupled to said first and second sets of contacts, a first group of said toroidal coil pairs functioning as a common mode filter and a second group of said toroidal coil pairs functioning as a differential mode filter.

3. The connector of claim 1, wherein said contact coupling printed circuit board includes a plurality of toroidal coil pairs coupled to said first and second sets of contacts, a first group of said toroidal coil pairs functioning as a common mode filter and a second group of said toroidal coil pairs functioning as a differential mode filter.

4. The connector of claim 1, further comprising a plurality of resistors, at least a portion of said resistors being coupled to said contact coupling printed circuit board.

5. The connector of claim 4, wherein said contact coupling circuit printed circuit board couples pairs of said first set of contacts, each pair of contacts of said first set of contacts being coupled to said capacitor through one of said resistors.

6. The connector of claim 4, wherein said housing comprises a receptacle having eight contacts, said first set of contacts comprising four of said eight contacts, said resistors comprising four resistors, said contacts of said first set of contacts being coupled in pairs through one of said resistors to said capacitor and said four contacts not constituting said first set of contacts being coupled in pairs through one of said resistors to said capacitor such that balanced signal pairs are provided.

7. The connector of claim 4, wherein the plurality of resistors are mounted on said contact coupling printed circuit board.

8. The connector of claim 1, wherein said capacitor has a plurality of folded pleats including a first pleat arranged at one end of said laminate assembly and a second pleat arranged at an opposite end of said laminate assembly, said first conductive sheet member being electrically coupled at said first pleat of said capacitor to said contact coupling printed circuit board, and said second conductive sheet member being electrically coupled at said second pleat of said capacitor to said metallic shield to thereby ground said first set of contacts through said capacitor.

9. The connector of claim 8, wherein said capacitor has an odd number of pleats in order to maintain the proper polarity to ground.

10. The connector of claim 1, further comprising a capacitor engaging pad mounted on said contact coupling printed circuit board, said first conductive sheet member being electrically coupled to said capacitor engaging pad.

11. A modular connector for mounting on a main printed circuit board and for receiving a plug, comprising

a housing including a receptacle for receiving a plug having eight contacts;

a first set of eight contacts arranged in said housing, each contact of the first set of eight contacts adapted to engage a respective contact of the plug, the first set of eight contacts forming four first contact pairs;

a second set of four contacts at least partially arranged in said housing for engaging the main printed circuit board, each contact of the second set of contacts being electrically coupled to a respective contact of the first set of contacts;

a set of four resistors, each resistor having a first end and a second end, the first end of each resistor coupled to a respective first contact pair;

a capacitor having a first end and a second end, the first end of the capacitor coupled to ground;

a common node, coupled to the second end of the capacitor and to the second end of each of the resistors, for providing balanced signal pairs and impedance to high frequency noise and interference.

12. A modular connector for mounting on a main printed circuit board and for receiving a plug, comprising

a housing,

a first set of contacts arranged in said housing each adapted to engage a respective contact of the plug,

a second set of contacts at least partially arranged in said housing for engaging the main printed circuit board,

a contact coupling printed circuit board arranged in said housing for electrically coupling said first and second sets of contacts, said contact coupling printed circuit board providing a signal path between respective ones of the first and second sets of contacts,

a capacitor coupled to said contact coupling printed circuit board for providing impedance to high frequency noise and interference, said capacitor including first and second conductive members, said first conductive member being electrically coupled to said contact coupling printed circuit board, and

a metallic shield at least partially surrounding said housing, the metallic shield for connection to a grounding region on the main printed circuit board, said second conductive sheet member being electrically coupled to said metallic shield to thereby ground said first set of contacts through said capacitor.

13. A modular connector for mounting on a main printed circuit board and for receiving a plug, comprising

a housing,

a first set of contact pairs arranged in said housing each of said first contact pairs adapted to engage a respective contact pair of the plug,

a second set of contact pairs at least partially arranged in said housing for engaging the main printed circuit board, each of the second contact pairs being electrically coupled to a respective one of the first contact pairs;

a respective resistor for each first contact pair, each resistor having a first end and a second end, the first end of each resistor coupled to its respective first contact pair;

a capacitor having a first end and a second end, the first end of the capacitor coupled to ground;

a common node, coupled to the second end of the capacitor and to the second end of each of the resistors, for providing balanced signal pairs and impedance to high frequency noise and interference.

14. The connector of claim 13, wherein said capacitor comprises a flexible laminate assembly, said first and second ends of said capacitor being first and second conductive sheet members, respectively, said first conductive sheet member being electrically coupled to said common node and said second conductive sheet member being electrically coupled to ground.

15. The connector of claim 14, wherein said capacitor has a plurality of folded pleats including a first pleat arranged at one end of said laminate assembly and a second pleat arranged at an opposite end of said laminate assembly, said first conductive sheet member being electrically coupled at said first pleat to said contact coupling printed circuit board and said second conductive sheet member being electrically coupled at said second pleat to ground.

16. The connector of claim 15, wherein said capacitor has an odd number of pleats in order to maintain the proper polarity to ground.

17. The connector of claim 13, wherein each first contact pair is coupled to its respective second contact pair via a respective first toroidal coil pair and a respective second toroidal coil pair each first toroidal coil pair functioning as a common mode filter and each second toroidal coil pair functioning as a differential mode filter.

18. The connector of claim 17, further comprising

a printed circuit board connected to the first set of contacts, the second set of contacts, and the capacitor, the printing circuit board having the resistors and the toroidal coil pairs mounted thereon, the printed circuit board including a circuit which electrically couples each of the second set of contacts to the respective one of the first set of contacts through the toroidal coil pairs, and which electrically couples each resistor to a respective first contact pair, and which electrically couples the capacitor and the resistors to the common node.

19. The connector of claim 13, further comprising

a printed circuit board connected to the first set of contacts, the second set of contacts, and the capacitor, the printing circuit board having the resistors mounted thereon, the printed circuit board including a circuit which electrically couples each of the second set of contacts to the respective one of the first set of contacts, and which electrically couples each resistor to a respective first contact pair, and which electrically couples the capacitor and the resistors to the common node.

20. The connector of claim 19, further comprising a capacitor engaging pad mounted on, and electrically coupled to, said contact coupling printed circuit board, said first end of the capacitor being electrically coupled to said capacitor engaging pad.

21. The connector of claim 13, further comprising

a metallic shield at least partially surrounding said housing, the metallic shield for connecting to a grounding region on the main printed circuit board, said first end of the capacitor being electrically coupled via said metallic shield to ground.

22. The connector of claim 13, wherein the capacitor includes first and second conductive members and an intermediate insulative material, said first conductive member forming the first end of the capacitor, the second conductive member forming the second end of the capacitor.