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RFID tag with modifiable and reversible read range

  • US 7,327,257 B2
  • Filed: 12/17/2004
  • Issued: 02/05/2008
  • Est. Priority Date: 12/17/2004
  • Status: Active Grant
First Claim
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1. A system comprisinga radio frequency identification (RFID) device and an antenna coupled to the RFID device, the RFID device comprising:

  • a read range control circuitry coupled to the antenna;

    the read range control circuitry to modify a read range of the antenna between a first read range and a second read range;

    wherein the RFID device is to obtain its operating power from a radio frequency signal received through the antenna.

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