Chipless Radio Frequency Identification Tags with Microstrip Patch Resonators

In this current study, we propose a coding information approach based on the magnitude level of the radar cross section (RCS) with a precise estimation considering the resonant characteristics of a multipatch chipless tag RFID. Combined with the classical frequency coding, this approach has the aim to increase the coding capacity. This paper introduces a 6-resonators RFID tag, based on a microstrip patch. Simulations show that the tag has high data capacity, low cost, and can be directly printed on products such as: personal ID, credit cards, paper, and textile because it needs only one conductive layer. The chipless tag is designed to operate in the range of 4.5 GHz to 6.2 GHz, allocated for RFID systems. Experimental measurements that are obtained in an anechoic chamber environment using a 6-resonators multi-patch chipless RFID tag, validate the simulation results.