| 摘要 |
A reader (100-1) transmits an interrogation wave to an RFID tag (200) through an antenna (102-1). A reader (100-2) transmits a power supply wave to the RFID tag (200) through an antenna (102-2). The waves to be transmitted in prescribed timing are switched, and the reader (100-1) transmits the power supply wave to the RFID tag (200) through the antenna (102-1). The reader (100-2) transmits the interrogation wave to the RFID tag (200) through the antenna (102-2).
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