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Proceedings/Recueil Des Communications Année : 2022

Humidity and Temperature Dual Flexible Microwave Sensor

Résumé

A dual flexible microwave sensor is presented for humidity and temperature sensing. The sensor consists of two microstrip interdigitated resonators printed on a flexible Kapton substrate. One resonator is coated with polyethyleneimine silane 1:0.5 and the other is left uncoated. The coated resonator at 3.26 GHz showed a good sensitivity of - 0.45 MHz/%RH and -0.01 dB/%RH in a range of 35 - 85 % RH, with low hysteresis (<5%), and -0.192 MHz/°C and 0.01 dB/°C in a range of 30 - 45 °C. On the other hand, the uncoated resonator showed a linear response and high hysteresis (> 30%) with a low sensitivity of -0.045 MHz/%RH and ~ 0 dB/%RH under humidity. It showed a temperature sensitivity of 0.07 MHz/oC and 0.01 dB/oC. RH sensitivity does not vary with temperature for both the coated and uncoated resonators. The uncoated resonator showed a distinct RH-independent temperature sensitivity in magnitude which makes it easier to decorrelate variations of both parameters.
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Dates et versions

hal-04322816 , version 1 (05-12-2023)

Identifiants

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Bernard Bobby Ngoune, Hamida Hallil, Stephane Bila, Dominique Baillargeat, Benoit Bondu, et al.. Humidity and Temperature Dual Flexible Microwave Sensor. IEEE, pp.1-4, 2022, ⟨10.1109/ICECS202256217.2022.9971127⟩. ⟨hal-04322816⟩
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