Low-power radio frequency identification reader

Details Low-power radio frequency identification reader Low-power radio frequency identification reader

1999-04-24

2000-11-21

Mullen, Thomas

Communications: electrical

Condition responsive indicating system

Specified power supply

340567, 34082534, G08B 2300

Patent

active

061509485

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.

REFERENCES:
patent: 4240064 (1980-12-01), DevChoudhury
patent: 4847485 (1989-07-01), Koelsch
patent: 5682032 (1997-10-01), Philipp
patent: 6040773 (2000-03-01), Vega et al.

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