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PRINTED CIRCUIT INDUCTIVE LOOP ANTENNA

  • US 3,641,576 A
  • Filed: 04/13/1970
  • Issued: 02/08/1972
  • Est. Priority Date: 04/13/1970
  • Status: Expired due to Term
First Claim
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1. A high-impedance printed circuit antenna for receiving radio signals within a predetermined frequency band and converting them into corresponding electrical signals for application to a relatively low-impedance radio input circuit, comprising:

  • means including a substantially planar nonconductive substrate for supporting said antenna;

    inductance means, including a loop of conductive foil having a discontinuity therein and deposited on said substrate, for receiving said radio signals and converting them into said electrical signals;

    impedance-matching means, including a conductive foil impedance element deposited on said substrate and connected to said inductance means, for transferring said electrical signaLs from said high-impedance antenna to said relatively low-impedance input circuit with maximum efficiency; and

    capacitance means connected to said inductance means and said matching means for broadly tuning said antenna to said frequency band, said capacitance means including a plurality of spaced interdigitated elongated strips of conductive foil deposited on said substrate and having successive strips alternately connected to said inductance means and to said matching means.

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