| 摘要 |
A passive transmitter incorporates a parametric device, e.g. a varactor diode. A tuned circuit derives energy received from a source of radiowaves, and is coupled to pump the varactor diode. The varactor diode produces a subharmonic output. Means are coupled to the varactor diode to modulate the subharmonic signal, and the modulated subharmonic output may be transmitted without amplification.
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