Validation of the presence of an electromagnetic transponder in the field of a reader
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United States of America Patent
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May 23, 2006
Grant Date -
Jan 31, 2002
app pub date -
May 11, 2001
filing date -
May 12, 2000
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method for controlling an electromagnetic field generation terminal using a signal for exciting an oscillating circuit, provided with circuitry for regulating the signal phase in the oscillating circuit, including comparing current values of variables linked to the current in the oscillating circuit and to the voltage thereacross with predetermined values, to detect the presence of a transponder in the electromagnetic field.
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