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Automobile antenna

  • US 4,811,024 A
  • Filed: 10/16/1985
  • Issued: 03/07/1989
  • Est. Priority Date: 10/17/1984
  • Status: Expired due to Term
First Claim
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1. An antenna system disposed within a hollow pillar of an automobile body, the hollow pillar having an opening, said antenna system being provided for picking up high frequency signals, said antenna system comprising:

  • loop antenna means provided for electromagnetically detecting a magnetic flux formed by high-frequency surface currents flowing concentratedly in an edge surface of the opening in the hollow pillar;

    a casing made of electrically conductive material for shielding an external electromagnetic field and for encasing said loop antenna means, said casing including an opening formed in one side through which only one side of said loop antenna means is externally exposed, said casing being disposed within the hollow pillar in which the high-frequency surface currents flow, said casing and said loop antenna means comprising a high-frequency pick-up means; and

    mounting means for mounting said casing, encasing said loop antenna means, within the hollow pillar such that said one side of said loop antenna means and the opening in said casing extends along the length of the hollow pillar opposite to and in close proximity to the edge surface of the opening in the hollow pillar.

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