Passive dynamic antenna tuning circuit for a radio frequency identification reader

  • US 20070013483A1
  • Filed: 06/29/2006
  • Published: 01/18/2007
  • Est. Priority Date: 07/15/2005
  • Status: Active Grant
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First Claim
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1. A tunable resonant circuit for a radio frequency identification (RFID) reader, wherein the reader transmits an activation signal to a transponder, the tunable resonant circuit comprising:

  • at least one resonant frequency-determining element;

    a dynamic tuning network in series with the resonant frequency-determining element for tuning the resonant circuit to a first resonant frequency value when the activation signal is on and to a second resonant frequency value when the activation signal is off.

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