Mode-diversity RFAID tag and interrogator system and method for identifying an RFAID transponder
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United States of America Patent
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Aug 21, 2007
Grant Date -
Nov 30, 2006
app pub date -
May 31, 2005
filing date -
May 31, 2005
priority date (Note) -
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Abstract
Methods and apparatus are provided for mode diversity radio frequency identification (RFAID). The apparatus comprises a first transducer configured to receive a first radio frequency (RF) signal, a second transducer configured to receive an acoustic signal, and an impedance modulator coupled to the first transducer and the second transducer and configured to emit a signal identifying an RFAID tag when the first transducer receives the first RF signal and/or the second transducer receives the acoustic signal. The method comprises transmitting an RF signal and an acoustic frequency signal, and detecting a first modulated signal indicating an RFAID transponder. The first modulated signal is based on one of the RF signal and the acoustic signal.
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