Appeal No. 2001-0752
Application 09/084,680
may be aluminum foil with aluminum or copper braid, and a
dielectric insulation layer positioned therebetween.
Specification, page 1. Signal attenuation in coaxial cables is a
function of dissipation factor in the dielectric constant of the
dielectric layer. Id. It is known in the art to utilize poly-
ethylene as dielectric insulation in coaxial cable since poly-
ethylene has a low dielectric constant and very low dissipation
factor. Id., pages 1-2. In applications which require
transmission of an electrical signal with as little loss of
signal attenuation as possible, it is also known to replace a
portion of the dielectric insulation material with a gas such as
nitrogen or argon. Id., page 2.
The dielectric layer in coaxial cable may further
include an antioxidant to prevent loss of physical properties
over time which are caused by oxidative degradation. Id. A
drawback of using these antioxidants is that they have a negative
impact on the dissipation factor of the insulation, which
adversely affects cable electrical properties. Id. Since
polarity was believed to be a cause of these adverse affects, it
was known in the art to use non-polar antioxidants. Id.
3
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