Chipless RFID tag for IoT applications

Radio Frequency Identification is a rapidly growing technology. Recent advances in wireless technology pave a path for integrating sensors with RFID system. The proposed tag consists of multiple resonators which are used for encoding the data. The tag can also be used for sensing applications by integrating dedicated resonator with the sensor element. Each spiral resonator is of a different length to encode data at different frequencies. Also, the length of spiral resonator and separation between them is adjusted so that there will be no coupling between them. The data encoding capacity is increased by increasing number of spiral resonators (of different length). The 12-bit encoded data is obtained among which 11-bits are used to encode the chipless RFID tag ID for tracking/identification, and the remaining one bit is used for sensing. The dimensions used in this design are 16.30 cm × 6.63 cm and analysis is carried out for both Taconic TLX™ and Rogers 4003C
^TM
substrates. For 12-bit multi-resonator design using Rogers 4003C
^TM
substrate, the overall bandwidth utilization is 1.7 GHz (1.2 GHz-2.9GHz). The tag can be used in various low-cost sensing applications. The encoding capacity can be further increased by adding more spectral resonators.