| 摘要 |
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. |
