Hand Motion-Modulated Chipless RFID for Gesture Recognition

This paper presents real-time identification of slow motion-modulated chipless RFID which can be applied to human hand gestures to realize a full-practical long-range RFID system with gesture recognition capability. Depolarizing chipless tags configured by hand in three gestures are utilized while different motion-induced modulation effects involved in each gesture are analytically modeled. The identification based on differential RCS and gesture recognition using deterministic IQ trajectories is theoretically and experimentally demonstrated. Using the real-time reading process, the designed gesture-modulated chipless tag is identified during a few seconds at distances up to 3 m while all the hand gestures are recognized at 2 m range based on the received IQ signature.