Optimisation of quarter wave microstrip open stub resonators for chipless RFID applications

High Security Chipless RFID Tags Using Frequency Shift Coding Technique

“…The tag requires a frequency band of 4 GHz to 7GHz to encode four bits. An eight bit chipless RFID tag using quarter wave open stub resonator is reported in [7], [8]. The tag encodes eight bits in a frequency band from 2.08 GHz to 4.03 GHz.…”

“…The tag identity is decoded from this reflected signal. Different approaches for designing spectral signature based chipless tags are reported in [4][5][6][7][8][9][10][11]. In these tags, each data bit is identified as the absence or presence of a resonance at a predetermined frequency.…”