| 摘要 |
An RFID tag device, which includes an analog/digital conversion circuit converting a size of a signal received via an antenna from an analog format to a digital format, and a transmission circuit transmitting the signal in digital format or the signal based on the signal in digital format via the antenna, is provided. Besides, an RFID reader/writer device, which includes a transmission circuit transmitting a signal via an antenna, and a conversion circuit receiving a signal representing a size of the transmitted signal via the antenna, and converting into distance information based on the received signal, is provided.
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