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Wireless IC tag, reader-writer, and information processing system

  • US 9,178,279 B2
  • Filed: 12/19/2011
  • Issued: 11/03/2015
  • Est. Priority Date: 11/04/2009
  • Status: Active Grant
First Claim
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1. An information processing system for performing wireless communication comprising:

  • a wireless IC tag; and

    a reader-writer;

    whereinthe wireless tag includes a wireless IC chip and at least two coil-shaped antennas;

    a first end of each of the at least two coil-shaped antennas is electrically connected to the wireless IC chip and second ends of the at least two coil-shaped antennas are electrically connected to each other;

    winding axes of the at least two coil-shaped antennas are arranged at different positions and the at least two coil-shaped antennas have a same winding direction;

    the reader-writer includes a reader-writer antenna and an information processing portion;

    the reader-writer antenna has a size substantially equal to a size of the at least two coil-shaped antennas of the wireless IC tag;

    a first end of the reader-writer antenna is electrically connected to a first end of the information processing portion, and a second end of the reader-writer antenna is electrically connected to a second end of the information processing portion;

    the at least two coil-shaped antennas of the wireless IC tag are wound and connected to each other so as to produce in-phase magnetic fields;

    the reader-writer antenna and the at least two coil shaped antennas of the wireless IC tag are overlaid directly on top of each other during communication; and

    the reader-writer antenna has a diameter substantially equal to a sum of diameters of the at least two coil-shaped antennas.

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