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Antenna with P.I.N. diode switched tuning inductors

  • US 4,564,843 A
  • Filed: 12/01/1981
  • Issued: 01/14/1986
  • Est. Priority Date: 06/18/1981
  • Status: Expired due to Term
First Claim
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1. A radio antenna for frequency agile operation at a plurality of frequencies in a predetermined frequency band, comprising:

  • a capacitive radiating/receiving element;

    a plurality of discrete tuning inductors coupled in series with said radiating/receiving element, said inductors having different inductances and having a short-circuiting switch, each said short-circuiting switch including at least two P.I.N. diodes arranged for switchably short-circuiting at least a part of the respective inductor;

    controller means coupled to said switches, for sequentially changing the tuning of the antenna by selectively applying a forward bias to said diodes to be maintained conductive and a reverse bias to said diodes to be maintained non-conductive; and

    at least one of said inductors being divided into a plurality of parts having separate switches for each of said parts.

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