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Antenna device and radio frequency IC device

  • US 8,070,070 B2
  • Filed: 12/02/2008
  • Issued: 12/06/2011
  • Est. Priority Date: 12/26/2007
  • Status: Active Grant
First Claim
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1. An antenna device included in a radio frequency IC device that is arranged to perform radio frequency communication with an external device, the antenna device comprising:

  • an antenna element including an antenna coil arranged to transmit or receive a radio frequency communication signal to or from the external device; and

    an additional resonance circuit that is connected to the antenna element, that includes at least one inductor, and has a resonance frequency characteristic different from a resonance frequency of the antenna element;

    whereina physical dimensional size of the at least one inductor of the additional resonance circuit is smaller than a physical dimensional size of the antenna coil.

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