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Tag communication system having a controlled antenna array to prevent interference

  • US 7,701,351 B2
  • Filed: 05/15/2007
  • Issued: 04/20/2010
  • Est. Priority Date: 05/15/2006
  • Status: Active Grant
First Claim
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1. A tag communication system comprising plural tag communication devices for performing wireless communication with a RFID tag attached to a moving body through a radio wave,wherein each of said plural tag communication devices is constructed by plural antenna elements and has an array antenna able to form a null of directivity of the antenna and a main lobe;

  • andsaid null is mutually opposed between one tag communication device and another tag communication device among said plural tag communication devices, and the directivity of each array antenna is controlled so as to direct said main lobe to a direction mutually causing no interference.

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