| 摘要 |
A passive transponder having the capability of producing a large number of unique identification signals. The transponder is provided with an antenna for receiving a relatively low-frequency signal which provides energy for activating the transponder. Oscillations in the received signal are utilized to time the sequential energization of a plurality of output terminals of an encoding device. Preselected ones of the output terminals are connected to signal utilization stages. A second encoding device sequentially energizes the signal utilization stages which are in turn coupled to a transmitter and serve to modulate the transmitted signal in a manner reflecting the pattern in which the output terminals are connected. A unique output signal is thereby produced for identifying the individual transponder.
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