A Quarter Mode Substrate Integrated Circular Cavity chipless tag based humidity sensor

This paper describes the design of an improved Radio frequency identification chipless tag-based humidity sensor. It is characterized by a reduced size, low losses, and high-quality factor. This work evaluates the ability of the tag to be used as a passive sensor detecting the humidity variation by means of a very sensitive material to the humidity. Results indicate that measurement and simulation results validate the feasibility of the proposed study.