Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2008-06-17
2008-06-17
Trieu, Van T. (Department: 2612)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S572100
Reexamination Certificate
active
07388497
ABSTRACT:
Radio frequency identification (RFID) includes far-field systems associated with an RFID interrogator and an RFID tag. The RFID interrogator produces continuous wave (CW) unmodulated signals selected from frequencies comprising a predetermined frequency band. The RFID tag includes reception and transmission antenna circuits, a signal processor, and an oscillator. The reception antenna circuit receives the reception signals from the RFID interrogator. The signal processor determines whether the reception signals correspond to a plurality of tag identification frequencies as a correlation. The signal processor also produces responsive signals in response to the correlation. The oscillator supplies a carrier frequency. The transmission antenna circuit combines the carrier signal with the response signals to produce transmit signals, and then dispatches the transmit signals.
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Corbett Blaise L.
Woodman Michael L.
The United States of America as represented by the Secretary of
Thielman Esq. Gerhard W.
Trieu Van T.
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