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Evaluation of the number of electromagnetic transponders in the field of a reader

  • US 20020021207A1
  • Filed: 05/11/2001
  • Published: 02/21/2002
  • Est. Priority Date: 05/12/2000
  • 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, adapted to cooperating with at least one transponder when said transponder enters this field, and including:

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

    means for evaluating, based on a measurement of a current in the oscillating circuit, a minimum number of transponders present in the field.

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