RFID SYSTEM, RFID READER-WRITER, RFID TAG, AND RFID COMMUNICATION METHOD

摘要

PROBLEM TO BE SOLVED: To suppress the degradation of communication quality even when there are interference signals in the frequency of response signals.

SOLUTION: The RFID system 1 includes the RFID reader-writer 4 for transmitting interrogation signals wherein the carrier waves of a first frequency are modulated by interrogation data signals, and the RFID tag 3 for receiving the interrogation signals transmitted from the RFID reader-writer 4 and returning response signals to the RFID reader-writer 4 wherein response data signals to the interrogation data signals are modulated by a mirror subcarrier system. The RFID reader-writer 4 includes: an interference determination part 50 for determining the presence/absence of the interference signals in the frequency of the response signals modulated by the mirror subcarrier system; and a frequency switching part 51 for switching the frequency of the carrier waves of a transmission part 45 to a second frequency different from the first frequency when it is determined that there are the interference signals by the interference determination part 50.

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