| 摘要 |
A surface acoustic wave transponder in which transducers (14) on the surface of a piezoelectric substrate (10) modify an interrogating signal. The transducers are phase encoded by selectively connecting their finger sets to respective busbars (11, 12) and by displacement relative to their nominal positions. Transducer fingers and track-crossing connections (20) are located sa as to cause cancellation of reflected surface acoustic waves. A marker transducer (15) assists decoding. In the encapsulation of the transponders a cover plate (35) or individual cover plates (24) are attached to the substrate prior to the cutting of individual transponders from the substrate.
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