Validation of the presence of an electromagnetic transponder in the field of a phase demodulation reader
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United States of America Patent
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Aug 28, 2007
Grant Date -
May 25, 2006
app pub date -
Oct 27, 2005
filing date -
May 12, 2000
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A terminal for generating an electromagnetic field adapted to communicating with at least one transponder, and a method for controlling such a terminal including: an oscillating circuit adapted to being excited by a remote supply signal of the transponder; a phase demodulator for detecting possible data transmitted by the transponder; circuitry for regulating the signal phase in the terminal's oscillating circuit on a reference value; circuitry for measuring variables linked to the current in the oscillating circuit and to the voltage thereacross; and circuitry for comparing current values of these variables with predetermined values, to determine the presence of a transponder.
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