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METHOD AND APPARATUS FOR LOCATING OBJECTS USING RADIO FREQUENCY IDENTIFICATION

  • US 20120146767A1
  • Filed: 06/06/2007
  • Published: 06/14/2012
  • Est. Priority Date: 06/06/2007
  • Status: Active Grant
First Claim
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1. A system for detecting non-linear radio frequency identification tags, the system comprising:

  • a transmitter, wherein the transmitter transmits a plurality of electromagnetic signals having a first frequency and a second frequency; and

    a receiver, wherein the receiver monitors for an electromagnetic signal having a third frequency equal to a difference between the first frequency and the second frequency, wherein the electromagnetic signal is generated by a non-linear tag in response to the non-linear tag receiving the plurality of electromagnetic signals, wherein the non-linear tag comprises an antenna, a logic control circuit, a memory, a power supply, and a sensor, and wherein the non-linear tag is detected when the electromagnetic signal at the third frequency is detected by the receiver.

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