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Antenna device and radio communication apparatus using the antenna device

  • US 20050128155A1
  • Filed: 12/08/2004
  • Published: 06/16/2005
  • Est. Priority Date: 12/11/2003
  • Status: Active Grant
First Claim
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1. An antenna device, comprising:

  • a variable reactance circuit having a reactance value variable on the basis of a control signal;

    an RF circuit having a matching circuit at an output side;

    an antenna element having one end to which an electrical signal is fed from the RF circuit and the other end terminated by the variable reactance circuit; and

    a reactance and matching control circuit that outputs the control signal for setting the reactance value of the variable reactance circuit to a predetermined value.

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