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Receiving loop antenna system

  • US 3,918,062 A
  • Filed: 07/24/1974
  • Issued: 11/04/1975
  • Est. Priority Date: 08/01/1973
  • Status: Expired due to Term
First Claim
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1. In A receiving loop antenna system especially adapted for use as a built-in antenna which consists of a loop antenna and a grounding plate perpendicular to the loop antenna for a portable wireless set, the antenna output terminals being tapped at such points that said antenna may be matched with the input impedance of said wireless set, the improvement comprising a series-connected circuit comprising a. a circuit having series resonant circuit characteristics and tuned to the center frequency of the operating frequency range of said wireless set, and b. a transmission line having such a length as to attain the impedance matching which minimizes the noise in the proximity of said center frequency, said series-connected circuit being inserted between the output terminals of said antenna and the input terminals of said wireless set.

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