Optimum performance for RFID tag immersed in dielectric media

While RFID tags near metal have been extensively evaluated in the literature, tags on and in dielectric media have received less scrutiny and rigorous evaluation. In this paper, we develop a rigorous theoretical model for the behavior of UHF RFID tags immersed in a dielectric medium using the Uda model and embedded T-match antenna. From this, we are able to investigate a number of criteria for optimality. We find that the simplest optimality condition is not physically realizable, and more realizable models yield several results that are of practical interest. We make two specific recommendations for future work to increase the accuracy and usefulness of this work.