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(a) The structure of chipless RFID humidity sensor(F. Deng et al., 2018). (b) Illustration of cross polarization humidity sensor (Fan et al., 2018). (c) The structure of the humidity sensor based on RSSI value (He et al., 2020). (d) Schematic of chipless RFID humidity sensor using an ELC resonator (Marchi et al., 2020).
