Easy strip composite dielectric coaxial signal cable

• US 5,107,076 A
• Filed: 01/08/1991
• Issued: 04/21/1992
• Est. Priority Date: 01/08/1991
• Status: Expired due to Term

• Current Assignee: W. L. Gore & Associates (W.L. Gore & Associates)
• Original Assignee: W. L. Gore & Associates (W.L. Gore & Associates)
• Inventors: Bullock, Roddy M., Cedrone, Alfredo
• Primary Examiner(s): NIMMO, MORRIS
• Application Number:
  US07/639,510
• Time in Patent Office: 469 Days
• Field of Search: 174/36, 174/107, 174/115
• US Class Current: 174/107
• CPC Class Codes: H01B 11/183 Co-axial cables with at least one helicoidally wound tape-conductor
• CPC Class Codes: H01B 11/1839 of cellular structure
• CPC Class Codes: H01B 7/38 with arrangements for facilitating removal of insulation

Abstract

A composite dielectric coaxial cable which is easily hand-strippable for termination without disturbing its drain wire or unravelling the metallized tape comprising its shielding layer.

Claims

1. A coaxial electric signal cable comprising:

(a) a core consisting of a metal center conductor surrounded by a first layer of tape-wrapped expanded polytetrafluoroethylene insulation, then a second layer of polymeric insulation, wherein the second layer of insulation is in intimate contact with, but not adhered to, the first layer;

(b) a conductive metal drain wire arranged parallel to said core;

(c) an outer conducting layer surrounding said core and said drain wire, comprising a helically-wrapped metal-coated polymer tape, metal side contacting said drain wire, and having a strip of heat-sealable adhesive on an edge of said tape on the same side of the tape as that bearing said metal; and

(d) a protective jacket;

wherein the outer portion of said first layer of insulation is sintered to thermoset after wrapping.

2. A cable of claim 1 wherein the radial thickness of said first layer is such that high-density termination to a multiconnector pin may be accomplished.

3. A cable of claim 1 wherein the radial thickness of said second layer is such that the required impedance and capacitance values are achieved between said inner and outer conductors.

4. A cable of claim 1 wherein said metal on said metal-coated polymer tape partially covers one side of said polymer tape to leave a continuous strip of metal-free tape adjacent said metal layer and said heat-sealable adhesive is applied to said tape on the same side as said metal layer on the edge of said strip which is metal-free.

5. A cable of claim 4 wherein said heat-sealable adhesive is applied to the opposite side of said tape as said metal.

6. A cable of claim 4 wherein said adhesive is a heat-sealable thermoplastic.

7. A cable of claim 1 wherein said drain wire is helically-wrapped around said core.

8. A cable of claim 1 wherein the metals of said signal conductor, said drain wire, and said outer conductor are selected from the group consisting of copper, metal plated copper, copper alloys, and aluminum.

9. A cable of claim 1 wherein said metal-coated polymer tape comprises polyester.