Mode-diveristy RFAID tag and interrogator system and method for identifying an RFAID transponder
First Claim
1. A radio frequency identification (RFAID) tag comprising:
- 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 said first transducer and said second transducer and configured to emit a signal identifying the RFAID tag when at least one of said first transducer receives said first RF signal and said second transducer receives said acoustic signal.
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Accused Products
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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Citations
20 Claims
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1. A radio frequency identification (RFAID) tag comprising:
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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 said first transducer and said second transducer and configured to emit a signal identifying the RFAID tag when at least one of said first transducer receives said first RF signal and said second transducer receives said acoustic signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An RFAID reader for identifying an RFAID transponder, the RFAID reader comprising:
a transceiver configured to;
transmit an RF signal and an acoustic signal;
receive at least one modulated signal from the RFAID transponder based on at least one of said RF signal and said acoustic signal; and
a processor coupled to said transceiver and configured to identify the RFAID transponder from said data signal. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method for detecting an RFAID transponder, the method comprising the steps of:
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transmitting an RF signal and an acoustic signal; and
detecting a first modulated signal indicating the RFAID transponder, the first modulated signal based on at least one of the RF signal and the acoustic signal. - View Dependent Claims (17, 18, 19, 20)
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Specification