Electricity: conductors and insulators – With fluids or vacuum – Conduits – cables and conductors
Patent
1989-02-10
1990-01-16
Nimmo, Morris H.
Electricity: conductors and insulators
With fluids or vacuum
Conduits, cables and conductors
156 51, 174110FC, 174110F, 333243, H01B 1118, H01B 1314
Patent
active
048944882
ABSTRACT:
A cable and method for making such cable is disclosed. The cable is especially suited for high frequency applications in which electrical attenuation and dissipation factor are of critical importance. The cable comprises a tubular outer conductor, and at least one inner conductor for transmission of electrical signals. Between the inner and outer conductor is a foamed dielectric material. This dielectric is formed from the extrusion of an olefin polymer or a fluoropolymer with a blowing agent gas. Sulfurhexafluoride (SF.sub.6), rather than environmentally unsafe chlorofluorocarbons, is used as a blowing agent to foam the dielectric.
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Comm/Scope, Inc.
Nimmo Morris H.
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