| 摘要 |
<P>PROBLEM TO BE SOLVED: To efficiently cancel a transmission leak signal by re-adjusting a leak signal canceler in accordance with a change in RF environment even during a collision prevention period. <P>SOLUTION: An RFID system 3 includes: a controller section 120 for sending a transmitting signal to an RFID tag 5 and reading a receiving signal transmitted from the RFID tag 5; a leak signal canceling section 140 which performs adjustment work for receiving a part of the transmitting signal and the receiving signal, generating a cancel signal in accordance with an adjustment value for canceling the part of the transmitting signal and a transmission leak signal, and canceling the transmission leak signal contained in the receiving signal; and a reader control section 110 for determining whether or not an RF environment in which the RFID tag 5 is mounted is changed, while using a strength of the receiving signal in accordance with a preset term, controlling operation of the leak signal canceling section in accordance with the change of the RF environment, and controlling operation of the controller section 120 reading the receiving signal transmitted from the RFID tag 5. <P>COPYRIGHT: (C)2012,JPO&INPIT |
