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Wireless IC tag reader

  • US 8,390,458 B2
  • Filed: 09/08/2008
  • Issued: 03/05/2013
  • Est. Priority Date: 09/25/2007
  • Status: Active Grant
First Claim
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1. A wireless IC tag reader comprising:

  • a receiving antenna with a maximum beam direction and a half-value angle;

    a transmitting antenna with a maximum beam direction and a half-value angle narrower than the half-value angle of the receiving antenna; and

    a maximum beam direction changing unit that changes the maximum beam direction of the transmitting antenna without changing the half-value angle of the transmitting antenna,wherein a main lobe of the receiving antenna encompasses the whole space in a communication region limited by a floor surface and a wall surface,andthe maximum beam direction changing unit changes the maximum beam direction of the transmitting antenna such that a main lobe of the transmitting antenna encompasses a wireless IC tag in the communication region without encompassing the floor surface and the wall surface in the communication region.

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