High frequency signal cable with improved electrical dissipation factor and method of producing same
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United States of America Patent
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Jan 16, 1990
Issued Date -
N/A
app pub date -
Feb 10, 1989
filing date -
Mar 21, 1988
priority date (Note) -
Expired
status (Latency Note)
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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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