Modeling and characterization of a substrate integrated chip-less RFID tag communication system

In this work a communication channel for substrate-integrated RFID tags is modeled and characterized. The tags are based on a substrate integrated cavity resonators where each resonator is connected to an antenna. An address is given to each tag based on different effective permittivity of the substrate-integrated cavity resonator. In order to study the signal propagation between the tag and the reader, the communication with the tags is modeled using a two-port matrix model consisting of a resonator and antennas matrix representations. The tags are fabricated and tested experimentally; the results are compared to the model. Parameters such as the distance between the tags and the reader and the reader´s antenna have been studied and their effect on the interrogation has been recorded. Finally, interrogation circuit architecture for substrate-integrated tags is proposed.