A study on a coding method for chipless RFID tags using multimode stepped impedance resonators

Abstract

Stepped impedance resonators (SIRs) are composed of multiple transmission lines having different characteristic impedances, and can control higher-order mode resonance frequencies. Here, by using these properties, identification codes from a resonator were systematically generated by introducing symmetric multimode SIRs composed of same-length transmission lines. In the other direction, resonator codes were identified by detecting their higher-order mode resonance frequencies. This paper describes these resonance properties and experimental results from multimode SIRs, and discusses their applicability in chipless RFID tags.