Evaluation of the number of electromagnetic transponders in the field of a reader
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United States of America Patent
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Apr 12, 2005
Grant Date -
Feb 21, 2002
app pub date -
May 11, 2001
filing date -
May 12, 2000
priority date (Note) -
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Abstract
A terminal for generating a high-frequency electromagnetic field by an oscillating circuit, adapted to cooperating with at least one transponder when the transponder enters this field, and a method for establishing a communication between the devices, including circuitry for regulating the signal phase in the oscillating circuit with respect to a reference value and circuitry for evaluating, based on a measurement of the current in the oscillating circuit, the minimum number of transponders present in the field.
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