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Radio frequency IC device and radio communication system

  • US 8,797,148 B2
  • Filed: 08/19/2010
  • Issued: 08/05/2014
  • Est. Priority Date: 03/03/2008
  • Status: Active Grant
First Claim
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1. A radio frequency IC device comprising:

  • a radio IC;

    an annular electrode coupled to the radio IC and including at least a pair of end portions; and

    a dipole radiation plate coupled to the annular electrode;

    whereina resonant frequency of the annular electrode is lower than a resonant frequency of the dipole radiation plate;

    both of the annular electrode and the dipole radiation plate define antenna elements;

    the annular electrode is a magnetic-field antenna element that communicates data of the radio IC using the lower resonant frequency; and

    the dipole radiation plate is an electric-field antenna element that communicates data of the radio IC using the higher resonant frequency.

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