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RFID tag modification for full depth backscatter modulation

  • US 7,760,073 B2
  • Filed: 01/04/2005
  • Issued: 07/20/2010
  • Est. Priority Date: 01/04/2005
  • Status: Active Grant
First Claim
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1. A modulated backscatter radio frequency identification device comprising:

  • a diode detector configured to provide a data signal as a result of electromagnetic energy received by the radio frequency identification device and to selectively modulate a reply signal onto an incoming continuous wave;

    communications circuitry configured to process the data signal and to provide a modulation control signal to the diode detector, the diode detector being configured to modulate the reply signal in response to the modulation control signal; and

    circuitry configured to increase impedance change at the diode detector which would otherwise not occur because the diode detector rectifies the incoming continuous wave while modulating the reply signal, whereby reducing the rectified signal increases modulation depth by removing the reverse bias effects on impedance changes.

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