A 3D modulated delay line based chipless TDR UWB RFID system with high suppression of multiple reflections
Multiple reflections that are created in the communication channel as well as on the tag itself have a high impact on the performance of time domain reflectometry (TDR) radio frequency identification (RFID) systems. In this paper we present a complete chipless delay line based TDR ultra wideband (UWB) system with low multiple reflections and a 3D modulation scheme. We use a minimum tag delay to reduce tag size as well as insertion loss on the tag, which decreases the maximum reading range and the maximum modulation order. Microstrip dividers are in place on the tag to block multiple reflections on it. Additionally, orthogonally polarized antennas at the reader and the tag are used to suppress clutter from the surroundings as well as from the tag itself. These measures assure a 12 bit data capacity and allow tag interrogation without any calibration. We provide a detailed analysis of the system architecture, verified by measurement results, to prove the capability of the system.
2016 46th European Microwave Conference (EuMC)