Electromagnetic intruder detector sensor cable
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United States of America Patent
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Nov 10, 1998
Grant Date -
N/A
app pub date -
Dec 13, 1996
filing date -
Oct 24, 1996
priority date (Note) -
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Abstract
A sensor cable formed of a center conductor surrounded by dielectric material and first and second layers. The first layer is formed of a gapped conductive material surrounding the dielectric material. The second layer has predetermined conductivity and at least covers the gaps in the conductive material of the first layer. The predetermined conductivity and thickness of the second layer is such that the skin depth in the second layer at an operating frequency of the cable is much greater than the thickness of the second layer, and inductive coupling into or out of the cable through gaps in the second layer is at least an order of magnitude greater than capacitive coupling into or out of the cable through gaps in the second layer.
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