NON-CONTACT WIRELESS COMMUNICATION APPARATUS, METHOD OF ADJUSTING RESONANCE FREQUENCY OF NON-CONTACT WIRELESS COMMUNICATION ANTENNA, AND MOBILE TERMINAL APPARATUS

  • US 20090146892A1
  • Filed: 11/14/2008
  • Published: 06/11/2009
  • Est. Priority Date: 12/07/2007
  • Status: Active Grant
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First Claim
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1. A non-contact wireless communication apparatus which receives a power supply from an external device by inductive coupling in a non-contact manner, to transmit/receive a signal with the external device, the non-contact wireless communication apparatus comprising:

  • a non-contact wireless communication antenna;

    a resonance capacitor, connected in parallel with the non-contact wireless communication antenna, for obtaining a predetermined resonance frequency with the non-contact wireless communication antenna;

    resonance frequency adjustment means for changing a resonance capacitance of the resonance capacitor to adjust the resonance frequency;

    capacitance change amount control means for controlling an amount of change in resonance capacitance of the resonance capacitor in the resonance frequency adjustment means;

    resonance frequency shift means for shifting the resonance frequency of the non-contact wireless communication antenna; and

    on/off control means for performing on/off control of the resonance frequency shift means in accordance with the amount of change in the resonance capacitance of the resonance capacitor by the capacitance variation control means.

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