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A chipless RFID identification based on time reversal algorithm is presented in this work. The key problems affecting the reliability of chipless RFID identification are analyzed by using the energy focusing feature of time reversal algorithm. Analysis carried out on the energy focusing model revealed that the time reversal array can realize the multi-antenna energy focusing at the tag, so as to improve the reading distance of chipless RFID tag. Furthermore, time reversal energy self-focusing algorithm was used to suppress the noise come from other scatters near the tag. Multi-tag identification can be realized by the application of selective focusing algorithm. MIMO time reveal antenna array and C shaped resonators chipless RFID tag simulation model is constructed to verify the correctness of the proposed method. The results show that two chipless RFID tags with a distance of 0.2 m in azimuth can be identified from 1 m away.

Chipless RFID identification based on time reversal algorithm