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Sensors and Materials, Volume 36, Number 2(1) (2024)
Copyright(C) MYU K.K.
pp. 403-413
S&M3527 Research Paper
Published: February 6, 2024

Wireless Humidity Sensing with Chipless Radio Frequency Identification Tag [PDF]

Bo Wang, Junqiang He, Yalun Song, Ke Wang, and Shengli Cao

(Received October 2, 2023; Accepted November 29, 2023)

Keywords: wireless humidity sensing, chipless RFID tag, moisture-sensitive film

In this study, a compact and flexible chipless radio frequency identification humidity sensor with dimensions of 21 × 21 mm2 is realized. The resonator structure consists of a square open ring and a U-shaped ring on a Rogers TMM 4(tm) substrate. The Kapton dielectric constant is very sensitive to changes in ambient humidity, and the sensor is capable of detecting humidity when the resonator is covered with a Kapton film. The amplitude of the radar scattering cross section increases monotonically from −65.66 to −58.14 dB with an offset of 7.52 dB when the relative humidity (RH) increases from 40 to 90%. The chipless sensor designed in this study has a compact size of only 21 × 21 mm2 with good resonance characteristics, and with the Kapton thin film covering, the sensor exhibits an excellent sensitivity of 0.15 dB/% RH. It also has a wide humidity measurement range from 40 to 90%.

Corresponding author: Bo Wang

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Cite this article
Bo Wang, Junqiang He, Yalun Song, Ke Wang, and Shengli Cao, Wireless Humidity Sensing with Chipless Radio Frequency Identification Tag, Sens. Mater., Vol. 36, No. 2, 2024, p. 403-413.

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