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WIRELESS IC DEVICE

  • US 20090262041A1
  • Filed: 07/02/2009
  • Published: 10/22/2009
  • Est. Priority Date: 07/18/2007
  • Status: Abandoned Application
First Claim
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1. A wireless IC device comprising:

  • a wireless IC chip;

    a radiation plate including a radiation electrode; and

    a functional substrate including a matching circuit arranged to perform impedance matching between the wireless IC chip and the radiation electrode, the functional substrate including a coupling electrode coupled to the radiation electrode, inductance elements, and a capacitance element;

    whereinthe matching circuit included in the functional substrate has a configuration such that a relationship between a reactance component of an impedance obtained by viewing the wireless IC chip from a connecting portion connecting the wireless IC chip and the functional substrate to each other and a reactance component of an impedance obtained by viewing the radiation electrode from the connecting portion connecting the wireless IC chip and the functional substrate to each other is a conjugate relationship.

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