Electricity: conductors and insulators – Conduits – cables or conductors – Conductive armor or sheath
Patent
1986-10-15
1989-03-28
Nimmo, Morris H.
Electricity: conductors and insulators
Conduits, cables or conductors
Conductive armor or sheath
156 50, 156 51, 174102SP, 427118, 427119, 427 40, 427 41, 427250, 427251, 427404, 427409, 427421, 428381, 428383, 428384, 428389, H01B 718
Patent
active
048166189
ABSTRACT:
A coaxial cable is provided having a ribbon inner conductor surrounded by a dielectric and a circumferential conductor. The coaxial cable may be microminiature comprising a very thin ribbon strip conductor from between 5 to 15 .mu.m thick and from 150 to 200 .mu.m wide, having a surrounding foamed dielectric or parylene applied thereon by a vapor plasma process and an outer conductor of an adhering high conductivity metal vacuum deposited on the dielectric. Alternately, the foam dielectric embodiment may have a contiguous parylene coating applied adjacent the inner conductor or the outer conductor or both. Also, the cable may be fabricated by forming a thin ribbon of strip conductive material into an inner conductor, applying thereabout a dielectric by spraying on a solution of polystyrene and polyethylene and then vacuum depositing and adhering high conductivity metal about the dielectric. The cable strength may be increased by adding glass microfilament fibers or glass microspheres to the solution of polystyrene and polyethylene. Further, the outer conductive layer may be applied by electroless deposition in an aqueous solution rather than by vacuum deposition. A thin coating of parylene is preferably applied to the outer conductor to prevent its oxidation and inhibit mechanical abrasion.
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patent: 2812501 (1957-11-01), Sommers
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patent: 3077569 (1963-02-01), Ikrath
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patent: 3573976 (1971-04-01), Duane
patent: 3772455 (1973-11-01), Nicodemus et al.
patent: 3990024 (1976-11-01), Hou
patent: 4352701 (1982-10-01), Shimba et al.
patent: 4581291 (1986-04-01), Bongianni
Nimmo Morris H.
University of California
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