High propagation speed coaxial and twinaxial cable

Details High propagation speed coaxial and twinaxial cable High propagation speed coaxial and twinaxial cable

2005-02-01

2005-02-01

Reichard, Dean A. (Department: 2831)

Electricity: conductors and insulators

With fluids or vacuum

Conduits, cables and conductors

C174S1130AS, C174S115000, C174S015600

Reexamination Certificate

active

06849799

ABSTRACT:
The amount of air dielectric in air core coaxial and twinaxial cables is increased by spacer structures installed between the center conductor and the outer shield which have provision for air voids or pockets running lengthwise. The extra air space provides lower effective dielectric constant for the cable. In one embodiment, a single-element extruded spacer is formed with air cavities or voids that run continuously throughout the length of the spacer. Several spacer “profiles” or cross-sections are disclosed that place less solid dielectric mass in proximity to the center conductor. The result is a greater volume of air dielectric, and hence a lowered cable dielectric constant. In a further embodiment the spacer is a circular cross-sectioned element consisting of a central dielectric strength member surrounded with foamed material. Strength strands such as Kevlar® may be added to the spacer.

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“High Speed Coax & Twinax”, Temp-Flex Cable Inc., 26 Milford Road, S. Grafton, MA 01560, [retrieved from the internet Aug. 29, 2003], URL<http;//www.tempflex.com/products/hscoax.asp and http://www.tempflex.com/datasheets/hscoax.html >, pp 2.

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