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Chip-based radio frequency identification (RFID) sensor systems have been investigated for structural health monitoring (SHM) applications. However, there are disadvantages to using chips in sensor tags in terms of price, robustness and detecting power. In this paper, we propose a reconfigurable RFID-based chipless tag sensor for strain detection, which detects structural strain by observing the offset of the resonant frequency of the antenna and incorporates an encoding unit for tag identification. To realize the reconfigurability of the antenna, a PIN diode is added to control the antenna, and the frequency reconfigurability of the antenna is realized by controlling the turn on/off of the PIN diodes. The Kalman filter algorithm is used to realize the information fusion of multiple sensors to improve the sensor detection accuracy, and the background noise data enhancement is used to expand the original data samples to fuse the information of the three sensors' data. The relative inaccuracy is roughly 33.5% less after fusion compared to the measurement alone. The antenna was fabricated by an etching process and measured using VNA to verify the accuracy of the antenna simulation results.

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