High-speed cable

• US 5,872,334 A
• Filed: 03/14/1997
• Issued: 02/16/1999
• Est. Priority Date: 03/14/1997
• Status: Expired due to Term

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Trazyik, William J.
• Primary Examiner(s): REICHARD, DEAN ALAN
• Application Number:
  US08/818,046
• Time in Patent Office: 704 Days
• Field of Search: 174/36, 174/117 F, 174/102 SC, 174/105 SC, 174/106 SC, 174/107, 174/108
• US Class Current: 174/36
• CPC Class Codes: H01B 11/1091 with screen grounding means, e.g. drain wires
• CPC Class Codes: H01B 11/203 forming a flat arrangement

Abstract

A high-speed cable includes first and second coaxial conductor sets which are disposed in mirror image fashion within a carbon-impregnated polymer jacket. Each coaxial conductor set includes a wire core surrounded by a dielectric layer and a ground conductor disposed along side the dielectric layer. The wire core, the dielectric layer and the ground conductor are themselves surrounded by a conductive shield layer. In addition to assisting in bleeding off accumulated electric charge, the polymer jacket also preserves conductor set alignment and planarity especially following handling, cutting, trimming and stripping operations. The cable is excellent for high-speed applications, is easily routed and preserves its electrical properties under various field conditions.

Claims

1. A high-speed cable comprising:

a first coaxial conductor set which includes;

a first conductive wire core;

a first dielectric layer surrounding said first wire core;

a first ground conductor exterior to and adjacent to said first dielectric layer;

a first conductive shield layer surrounding said first dielectric layer and also surrounding and in contact with said first ground conductor;

a second coaxial conductor set which includes;

a second conductive wire core;

a second dielectric layer surrounding said second wire core;

a second ground conductor exterior to and adjacent to said second dielectric layer;

a second conductive shield layer surrounding said second dielectric layer and also surrounding and in contact with said second ground conductor;

said first and second coaxial conductor sets being disposed adjacent to one another with said first and second conductive shield layers being in electrical contact with each other, and with said first ground conductor, said first wire core, said second wire core and said second ground conductor lying substantially in the same plane, and with said first and second ground conductors being disposed in opposed positions with respect to said cores; and

a polymer jacket impregnated with conductive material and surrounding said first and second coaxial conductor sets and in contact with said first and second conductive shield layers.

2. The cable of claim 1 in which said first and second conductive wire cores comprise solid copper.

3. The cable of claim 1 in which at least one of said first and second dielectric layers comprise polytetrafluroethylene.

4. The cable of claim 1 in which at least one of said first and second conductive shield layers comprises aluminum.

5. The cable of claim 1 in which said first and second conductive shield layers are disposed in a spiral fashion.

6. The cable of claim 1 in which said conductive material impregnating said polymer jacket comprises carbon particles.