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Radio communication device, radio communication method and non-contact IC card reader/writer device

  • US 7,562,828 B2
  • Filed: 09/12/2005
  • Issued: 07/21/2009
  • Est. Priority Date: 02/28/2005
  • Status: Active Grant
First Claim
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1. A radio communication device capable of communicating with a plurality of kinds radio communication media having different resonant frequencies, comprising:

  • a modulation circuit for modulating transmission data;

    an output line circuit for outputting signals modulated by the modulation circuit;

    a transmission/reception antenna for transmitting the signals from the output line circuit to the radio communication media and receiving signals from the radio communication media;

    an input line circuit for inputting signals from the transmission/reception antenna;

    a phase control circuit for controlling phases of signals from the input line circuit; and

    a demodulation circuit for demodulating an output from the phase control circuit;

    wherein the phase control circuit controls its own resonant frequency to a second resonant frequency which is different from a first resonant frequency of the transmission/reception antenna, tuned to and resonated with resonant frequencies of the radio communication media and which is not resonated with the resonant frequencies of the radio communication media.

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