Low-power radio frequency identification reader
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United States of America Patent
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-
Nov 21, 2000
Grant Date -
N/A
app pub date -
Apr 24, 1999
filing date -
Apr 24, 1999
priority date (Note) -
In Force
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Abstract
Practical battery operation of radio-frequency proximity readers is made possible by monitoring activity in the RFID reader's sensing field with a secondary detector such as a passive infrared detector, and powering up the RFID reader only upon detection of activity by the secondary detector. The RFID reader is kept to a low duty cycle relative to the secondary detector which is chosen for relatively low power consumption to achieve a net reduction in operating power requirements of the combined RFID reader and secondary detector.
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