| 摘要 |
A transponder is provided which includes an antenna circuit to perform communication with an interrogator, which is a communication subject, via electromagnetic waves. The antenna circuit includes a coil and a variable capacity circuit mutually connected in parallel, and the tuning frequency thereof is a first frequency. The transponder also includes a tuning frequency control circuit to switch the tuning frequency of the coil and the variable capacity circuit mutually connected in parallel to a second frequency in the case of transmitting electromagnetic waves with the antenna circuit.
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