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RFID PORTAL SYSTEM WITH RFID TAGS HAVING VARIOUS READ RANGES

  • US 20110050400A1
  • Filed: 08/25/2009
  • Published: 03/03/2011
  • Est. Priority Date: 08/25/2009
  • Status: Active Grant
First Claim
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1. A method for selectively reading radio frequency identification (“

  • RFID”

    ) tags within an RFID interrogation zone, a portion of the RFID tags having a first operating range and a portion of the RFID tags having a second operating range different from the first operating range, each RFID tag being programmed with an identifier associated with the operating range of the RFID tag, the method comprising;

    transmitting a first interrogation signal having sufficient power to activate RFID tags located within the RFID interrogation zone which have the first operating range;

    receiving a response signal from each RFID tag capable of receiving the first interrogation signal, each response signal indicating the identifier of the associated RFID tag; and

    selecting each RFID tag having an identifier associated with the first operating range.

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