| 摘要 |
<p>The proposed device comprises an interrogator/receiver and a passive transponder. The interrogator/receiver comprises a clock signal generator (1), a group of bandpass filters (5), a section to decode the data received, means (4) for inductively coupling the interrogator/receiver to the transponder. The transponder comprises a section (E) for picking up the power signal transmitted by the interrogator/receiver, a section (B) to codify the signal obtained according to a predetermined code, stored in a memory (15), a section (G) for phase modulating the codified data so as to allow air transmission. Particularly, the bandpass filters (5) are capable to detect a frequency band width lower than one thousandth of the signal's frequency.</p> |
