Method of making a foamed insulation coaxial cable for hyperfrequencies transmissions
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United States of America Patent
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May 5, 1987
Grant Date -
N/A
app pub date -
Sep 25, 1984
filing date -
Sep 29, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention concerns a method for producing a coaxial cable intended for the transmission of very high frequency signals. This coaxial cable comprises a dielectric insulating layer composed of foamed polytetrafluoroethylene or a composition comprising at least 80% of this product named hereinafter COMPOUND. The layer of insulating material is directly obtained by cold extrusion of a COMPOUND powder, the intimate mixing of a pore-forming agent and a foaming agent and a lubricating oil. The mixing of the COMPOUND powder, the pore-forming and foaming agents is effected dry or in aqueous dispersion. Principal application: Fields of use of ultra-high frequencies such as radars and transmissions.
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