Dynamic antenna tuning circuit for a radio frequency identification reader
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United States of America Patent
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May 3, 2011
Grant Date -
Aug 20, 2009
app pub date -
Apr 29, 2009
filing date -
Jun 29, 2006
priority date (Note) -
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Abstract
A resonant antenna circuit for a radio frequency identification (RFID) reader generates an electrical signal for activating a passive identification tag. The identification tag in turn generates a coded electrical signal that is detected by the reader. The electrical characteristics of the resonant circuit are actively and dynamically altered so that the antenna performs more optimally during the transmit and receive intervals.
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