2018 Volume 11 Pages E18-001-1-E18-001-12
This paper proposes multimode stepped impedance resonators with short-circuited ends, and descriptions are also given for a detection method using electromagnetic probes and a method of code identification. The stepped impedance resonators are composed of multiple transmission lines with different characteristic impedances, and they can control higher-order mode resonance frequencies. Using their intrinsic properties, identification codes from a resonator can be systematically generated by introducing symmetric multimode stepped impedance resonators with short-circuited ends, and these codes can be identified by detecting the higher-order mode resonance frequency.
The experimental results show that proposed resonators can be used in chipless RFIDs, which have the advantages of a small tag size, accurate code detection, and minimal effects from reflections from the environment.