High frequency signal cable with improved electrical dissipation factor and method of producing same
US4894488A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 10, 1989 |
| Grant date | Jan 16, 1990 |
| Priority date | — |
| Expiry date | Feb 10, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01B13/142
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.