| 摘要 |
A transponder device, receiving a plurality of waves having differing frequencies, and producing a wave, having a frequency differing from the plurality of received waves, having characteristic modifications, having a mixer, receiving at least two waves and producing a mixed wave having a frequency differing from the received plurality of waves; and a wave modifying device, producing a characteristically modified wave from an input wave, the mixer being interconnected with the wave modifying device to produce, from the received plurality of waves, an output which is both characteristically modified and at a frequency of the mixed wave. The device may include one or more antenna structures, and preferably produces a mixed wave which is then characteristically modified and emitted from the device. The wave modifying device is, for example, a semiconductor modulator or an acoustic wave device.
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