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RFID carrier sensing method and FRID system using this FRID carrier sensing method

  • US 20070279193A1
  • Filed: 07/27/2007
  • Published: 12/06/2007
  • Est. Priority Date: 01/31/2005
  • Status: Active Grant
First Claim
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1. An RFID system, comprising:

  • a reader/writer which has a reader/writer main body section and an antenna capable of polarization switching, and which sends a continuous carrier wave; and

    a tag which uses tag information to modulate the continuous carrier wave and sends back a response signal to the reader/writer, wherein the reader/writer main body section judges the level of a received interference signal and determines a channel and polarization direction for which the level of the interference signal is equal to or less than a threshold value, and receives a response signal from the tag in the determined channel and polarization direction.

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