COAXIAL CABLE FOR CAR AERIALS

摘要

Improvement of the construction of coaxial cable for automobile antennas that enables to achieve the minimum working electrical capacity, which conditions achieving minimum interference of a car engine with AM and FM radio signals. The principle of the solution consists in double-layer insulation coating of the core /1/ made of metal wire. The first layer /2/ is made of full non-polar plastic insulation with hardness above 50 Shore and the second layer /3/ applied on the first layer /2/ is made of expanded polyethylene with relative electric permittivity epsilon /r/ < 1.6. The thickness of the full insulation layer /2/ in relation to the minimum semi-diameter of the coaxial cable bending corresponds to the following condition: d1>= 3d./D1/d0/,where d1 is the diameter above the full insulation, d is the diameter above the inner core, D1 is the resulting diameter above the insulation and d0 is minimum semi-diameter of the coaxial cable bending and of an insulation layer of expanded polyethylene applied on it, with a relative electrical permittivity epsilon /r/ < 1.6.<IMAGE>