| 摘要 |
A transponder of a communication system, which has a high modulation factor for stable communication, and wherein an impedance element in the form of a coil is connected to an antenna of the transponder, and a resistor and a switching element in the form of a diode a high-frequency wave of which is grounded are connected to the coil. The antenna is a monopole antenna having a low impedance, and the coil has an inductance of 10 nH. Application of an electric current of 100 mA to the diode causes a phase difference of 122 degrees and an amplitude ratio of 1.1 with respect to a phase when the electric current is not applied to the diode.
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