Wave transmission lines and networks – Long lines – Shielded type
Patent
1991-04-04
1994-12-06
Lee, Benny T.
Wave transmission lines and networks
Long lines
Shielded type
174 28, 174108, H01P 306
Patent
active
053714849
ABSTRACT:
A low attenuation coaxial cable for carrying microwave energy at GigaHertz frequencies includes a center conductor, dielectric surrounding the center conductor and an outer conductor encircling the dielectric. This outer conductor is formed by a plurality of longitudinally extending conductive wire strands positioned adjacent one to another with a slight helical lay along the cable. Internal ruggedization includes a bedding layer of indentable dielectric material encircling the outer conductor with a single-layer ruggedizing winding of strong wire sufficiently tightly wound around the bedding layer for partially indenting this strong wire into the bedding layer. A protective outer jacket of tough plastic material surrounds the ruggedization layer. The helical lay of strong wire in the ruggedization layer is opposite to the slight helical lay of wire strands of the outer conductor. From two to twenty-four individual wires may be included in the ruggedization layer, but the helix angle of each turn of each wire is at least 50.degree.. The maximum VSWR and the attenuation loss throughout a range in frequencies from 0.04 to 18 GHz remained essentially the same in spite of a crushing load up to 180 pounds imposed on two lineal inches of cable length. Cable performance remained essentially constant when tested in an overhand knot and untied. Performance remained essentially constant when bent around a one-quarter inch radius and remained satisfactory even when bent around a one-eighth inch radius.
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Insulated Wire Incorporated
Lee Benny T.
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