A Multi-Resonator Chipless Tag System Employing Miniaturized Resonators and a Novel High-Resolution Detecting Technique

This paper presents the basic design and prototype results of a multi-resonator chipless tag system utilizing a notch filter architecture. The system integrates newly developed compact tag resonators featuring high unloaded-Q value and a high-resolution tag detection method that identifies the resonance point using the group delay time. A detailed study of both the resonator and the group delay time detector was conducted in the microwave band. Based on these results, a 21-bit tag and group delay time detector were prototyped, confirming the basic characteristics and usefulness of the tag system. It was also revealed that by arranging these tags two-dimensionally, 126 bits can be implemented on a credit card-sized board.