| Citation: | WANG B，LI Y W，WANG K. Design of a low cost chipless RFID humidity sensor[J]. Journal of Beijing University of Aeronautics and Astronautics，2024，50（3）：1047-1052 （in Chinese） doi: 10.13700/j.bh.1001-5965.2023.0161
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It is of great significance to design a low cost chipless radio frequency identification (RFID) sensor for environmental humidity monitoring. Polyvinyl alcohol (PVA) film is used as a humidity-sensitive material and the overall size of the rectangular substrate is 18 mm×18 mm×0.5 mm. Based on simulation studies and the humidity sensing principle, the permittivity of the humidity-sensitive material PVA changes in response to changes in ambient humidity, which in turn influences the resonant frequency shift of the entire sensor. The simulation results show that the designed humidity sensor operates in the range of 21.9%−52.5% for relative humidity, corresponding to the resonant frequency range of the sensor 2.76−2.51 GHz, the total offset reaches 250 MHz and the maximum relative humidity sensitivity is 23.08 MHz/%. The compact size, straightforward construction, and affordable price of the developed humidity sensor make it suitable for a range of humidity monitoring applications.
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