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.