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Electrically tuned resonance circuit using piezo and magnetostrictive materials

  • US 20060154617A1
  • Filed: 01/11/2005
  • Published: 07/13/2006
  • Est. Priority Date: 01/11/2005
  • Status: Active Grant
First Claim
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1. A tuning apparatus for tuning an impedance of an antenna coupled to an electromagnetic wave transmitter, the apparatus comprising:

  • a piezoelectric capacitor;

    a magnetostrictive inductor coupled in parallel with the piezoelectric capacitor to form a resonance circuit, said resonance circuit being in electrical communication with said antenna;

    a biasing circuit for biasing each of said piezoelectric capacitor and said magnetostrictive inductor to thus alter a resonant frequency of said resonance circuit; and

    a controller for controlling said biasing circuit in accordance with a frequency of said transmitter to match said impedance of said antenna to said impedance of said transmitter.

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