Detection of an electric signature of an electromagnetic transponder
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United States of America Patent
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May 16, 2006
Grant Date -
Sep 4, 2003
app pub date -
Aug 9, 2001
filing date -
Aug 9, 2000
priority date (Note) -
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Abstract
The invention concerns a terminal generating a high-frequency electromagnetic field by means of an oscillating circuit, adapted to co-operate with at least a transponder when the latter enters said field, comprising means (37) for regulating the phase of the signal in the oscillating circuit with respect to a reference value, and means for detecting, on the basis of a current measurement in the oscillating circuit and a voltage measurement at the terminals of a capacitive element (31) of said oscillating circuit, an electric signature of a transponder.
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