Adaptation of the transmission power of an electromagnetic transponder reader
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United States of America Patent
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-
Nov 1, 2005
Grant Date -
Aug 23, 2001
app pub date -
Jan 26, 2001
filing date -
Jan 31, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A terminal for generating an electromagnetic field adapted to cooperating with at least one transponder when the latter enters its field and including an oscillating circuit adapted to receiving a high-frequency A.C. excitation voltage, circuitry for regulating the signal phase in the oscillating circuit with respect to a reference value, circuitry for determining an instantaneous information relative to the magnetic coupling between the transponder and the terminal, and circuitry for adapting the electromagnetic field power according to at least said present information.
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