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Detection of an electric signature of an electromagnetic transponder

  • US 20030164742A1
  • Filed: 03/06/2003
  • Published: 09/04/2003
  • Est. Priority Date: 08/09/2000
  • Status: Active Grant
First Claim
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1. A terminal for generating a high-frequency electromagnetic field by means of an oscillating circuit (R1, L1, 31), adapted to cooperating with at least one transponder when said transponder enters this field, and characterized in that it includes:

  • means (37) for regulating the signal phase in the oscillating circuit with respect to a reference value; and

    means for detecting, based on a measurement of the current in the oscillating circuit and on a measurement of the voltage across a capacitive element (31) of the oscillating circuit, an electric signature (K2) of a transponder.

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