ASYMMETRIC COMMUNICATION CABLE SHIELDING
An asymmetric composite cable shield for use in communications cable that includes a protective layer clad with inner and outer layers of copper or a copper alloy, in which the inner layer is thicker than the outer layer.
1 . A communication cable comprising:
a plurality of conductor wires forming a central core;
an inner insulating layer surrounding the central core;
a cable shield surrounding the inner insulating layer;
and an outer insulating layer surrounding the cable shield, the cable shield comprising a protective layer bonded between an inner and an outer copper or copper alloy cladding layer, wherein the inner cladding layer is thicker than the outer cladding layer.
2 . The communication cable of claim 1 , wherein the protective layer comprises steel or a steel alloy.
3 . The communication cable of claim 1 , wherein the cable shield is corrugated.
4 . The communication cable of claim 1 , wherein the inner cladding layer is at least twice as thick as the outer cladding layer.
5 . The communication cable of claim 1 , wherein the inner cladding layer is at least four times as thick as the outer cladding layer.
6 . The communication cable of claim 1 , wherein the inner cladding layer is at least eight times as thick as the outer cladding layer.
7 . The communication cable of claim 1 , wherein the inner cladding layer is at least twelve times as thick as the outer cladding layer.
8 . The communication cable of claim 1 , wherein the protective layer has a thickness of about 100% to about 300% of the combined thickness of the inner and outer cladding layers.
9 . The communication cable of claim 1 , wherein the percentage thickness of the outer cladding layer is about 5-10%, the protective layer is about 45-65%, and the inner cladding layer is about 30-50%, wherein the percentage thickness of all three layers combined is 100%.
10 . The communication cable of claim 1 , wherein the cable shield has a thickness in the range from about 3 mil to about 5 mil.
11 . An asymmetrical cable shield comprising:
a protective layer bonded between an inner and an outer copper or copper alloy cladding layer, wherein the inner cladding layer is thicker than the outer cladding layer.
12 . The asymmetrical cable shield of claim 11 , wherein the protective layer comprises steel or a steel alloy.
13 . The asymmetrical cable shield of claim 11 , wherein the inner cladding layer is at least twice as thick as the outer cladding layer.
14 . The asymmetrical cable shield of claim 11 , wherein the inner cladding layer is at least four times as thick as the outer cladding layer.
15 . The asymmetrical cable shield of claim 11 , wherein the inner cladding layer is at least eight times as thick as the outer cladding layer.
16 . The asymmetrical cable shield of claim 11 , wherein the inner cladding layer is at least twelve times as thick as the outer cladding layer.
17 . The asymmetrical cable shield of claim 11 , wherein the protective layer has a thickness of about 100% to about 300% of the combined thickness of the inner and outer cladding layers.
18 . The asymmetrical cable shield of claim 11 , wherein the percentage thickness of the outer cladding layer is about 5-10%, the protective layer is about 45-65%, and the inner cladding layer is about 30-50%, wherein the percentage thickness of all three layers combined is 100%.
19 . The asymmetrical cable shield of claim 11 , wherein the asymmetrical cable shield has a thickness in the range from about 3 mil to about 5 mil.
20 . A method of making an asymmetrical cable shield, the method comprising the steps of:
sandwiching a sheet of protective material between a sheet of copper or copper alloy outer cladding material and a sheet of copper or copper alloy inner cladding material;
roll bonding the sheets of outer cladding material, protective material, and inner cladding material to provide a roll bonded material comprising a protective layer bonded between an inner and an outer copper or copper alloy cladding layer, wherein the inner cladding layer is thicker than the outer cladding layer; and
cutting the roll bonded material to size to provide asymmetrical cable shielding.
21 . The method of claim 20 , further including the step of annealing the roll bonded material.
22 . The method of claim 20 , wherein the percentage thickness in the asymmetrical cable shielding of the outer cladding layer is about 5-10%, the protective layer is about 45-65%, and the inner cladding layer is about 30-50%, wherein the percentage thickness of all three layers combined is 100%.
23 . The method of claim 20 , wherein the asymmetrical cable shielding has a thickness in the range from about 3 to about 5 mil.
24 . The method of claim 20 , wherein the protective layer comprises steel or a steel alloy.