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RADIO FREQUENCY IDENTIFICATION READER ANTENNA HAVING A DYNAMICALLY ADJUSTABLE Q-FACTOR

  • US 20110205026A1
  • Filed: 10/11/2010
  • Published: 08/25/2011
  • Est. Priority Date: 10/09/2009
  • Status: Active Grant
First Claim
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1. A reader circuit for a radio frequency identification (RFID) reader having a dynamically adjustable Q-factor, wherein the reader transmits an activation signal configured to activate full duplex transponders, the reader circuit comprising:

  • a signal source configured to drive a resonant antenna; and

    a dynamic switching circuit configured to set the Q-factor of the resonant antenna to a first value during the transmission of the activation signal;

    wherein the dynamic switching circuit is configured to set the Q-factor of the resonant antenna to a second value below the first Q-factor value during detection of a data signal from a full duplex transponder.

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