| 摘要 |
<p>A passive RF identification tag (10) comprising a piezoelectric transducer (11) for receiving a pulse of RF radiation and generating an acoustic pulse (12), and an arrangement of staggered reflectors (13) each displaced a different distance from the transducer. The reflectors receive the acoustic pulse and reflect back as a respective reflected acoustic pulse (14) toward the piezoelectric transducer, so as to generate therein a respective RF pulse train wherein successive pulses are separated in time according to the respective displacement of the reflectors from the transducer. The resultant RF pulse train is characteristic of the arrangement of reflectors.</p> |
