LOW-POWER RADIO FREQUENCY IDENTIFICATION READER

摘要

Practical battery operation of radio-frequency proximity readers (12) in a tag reader system (10) is made possible by monitoring activity in the RFID reader's sensing field (S) with a secondary detector (20) such as a passive infrared detector having an overlapping field of view (V), 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.