Simple Chipless RFID Tag Configurations

Two unique configurations of chipless RFID tag are reported in this paper. They consist of integrated L-resonators and cross polarized transmitting and receiving circular patch antennas. The validations of the proposed designs have been carried out using 8-bit data encoded tags, for the frequency band of 3.3-5.8 GHz, and microstrip circular antenna prototypes on Rogers substrate. The measured power difference of more than 15dB between the presence and absence bits, can enable precise detection of bits. These features blended with simple design scheme make them potentially suitable for low power applications such as IoTs and for mass production and deployments.