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Wireless IC device

  • US 7,518,558 B2
  • Filed: 03/05/2008
  • Issued: 04/14/2009
  • Est. Priority Date: 04/14/2006
  • Status: Active Grant
First Claim
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1. A wireless IC device comprising:

  • a flexible sheet including a wireless IC chip, radiation plates, and a feeder circuit provided thereon;

    whereinthe feeder circuit has a predetermined resonant frequency and a predetermined impedance;

    the wireless IC chip is connected to the feeder circuit;

    the feeder circuit and the radiation plates are coupled with each other such that a transmitted signal is radiated from the radiation plates and a received signal is supplied to the wireless IC chip; and

    the feeder circuit has a structure such that the predetermined resonant frequency thereof substantially corresponds to a resonant frequency of at least one of the transmitted signal or the received signal.

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