Radio frequency identification tag
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United States of America Patent
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Jun 17, 2008
Grant Date -
N/A
app pub date -
Feb 1, 2006
filing date -
Sep 17, 2003
priority date (Note) -
In Force
status (Latency Note)
Importance
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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