A collision avoidance methodology for chipless RFID tags

This paper proposes a new anti-collision algorithm for simultaneous interrogation of multiple chipless RFID tags and decoding their IDs. Linear Frequency Modulated (LFM) signal is used as the interrogation signal. Received signal is a summation of overlapping LFM signals from multiple tags. After processing the received signal with the proposed algorithm, IDs of individual tags are identified. It can be used as an effective collision avoidance technique for the frequency spectral based chipless RFID tags.