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Vehicle antenna system

  • US 4,804,968 A
  • Filed: 08/06/1986
  • Issued: 02/14/1989
  • Est. Priority Date: 08/09/1985
  • Status: Expired due to Term
First Claim
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1. A vehicle antenna system for detecting surface high frequency currents, induced by broadcast waves on a vehicle body and concentrated into marginal edges of the vehicle body, said antenna system comprising:

  • a case made of electrically conductive material and having an opening along one side thereof;

    high frequency pickup means being disposed within said case and including a loop antenna having a length and a width, the length of said loop antenna being opposite the opening in said case, said high frequency pickup means further including a varicap diode connected to said loop antenna for changing the opening area of said loop antenna, said high frequency pickup means being provided for detecting the surface high frequency currents induced on a marginal edge portion of the vehicle body; and

    mounting means for mounting said case containing said high frequency pickup means with the opening of said case being arranged parallel and in close proximity to the marginal edge portion of the vehicle body.

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