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Adaptation of the transmission power of an electromagnetic transponder reader

  • US 6,960,985 B2
  • Filed: 01/26/2001
  • Issued: 11/01/2005
  • Est. Priority Date: 01/31/2000
  • Status: Active Grant
First Claim
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1. A terminal for generating an electromagnetic field adapted to cooperating with at least one transponder when the at least one transponder is within said electromagnetic field and including an oscillating circuit adapted to receiving a high frequency A.C. excitation voltage, including:

  • means for maintaining a constant phase relationship between a signal in the oscillating circuit and a reference signal;

    means for determining an instantaneous information relative to an instantaneous magnetic coupling between the transponder and the terminal; and

    means for adapting a power of the electromagnetic field according to at least said instantaneous information.

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