Printed microwave frequency humidity sensor operating with phase shifting scheme


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Eyebe, G. A., Bideau, B., Loranger, E. et Domingue, F. (2021). Printed microwave frequency humidity sensor operating with phase shifting scheme. IEEE Sensors Journal, 21 (3). pp. 2854-2863. ISSN 1530-437X DOI 10.1109/JSEN.2020.3021951

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This paper investigates a shifting sensing scheme combining slots, transmission lines, and printing technologies. This sensing scheme translates the electrical sensitivity of a transmission line conductor to the insertion phase as a measurement variable. A coplanar waveguide (CPW) based structure was designed, screen-printed, and tested on relative humidity (RH) conditions ranging from 22.8-75.3 %RH. For the first time, a composite material made of poly-pyrrole and TEMPO Oxidized Cellulose Nanofibers (TOCN/PPy) was integrated to the structure and studied as a humidity sensitive conductor in microwave frequencies. The measured sensitivity was 0.154°/%RH at 5.870 GHz, while insertion losses decreased by 1.26 dB. The effects of sensing layers thickness as well as trade-off considerations between phase sensitivity and signal attenuation were analyzed by simulation. © 2001-2012 IEEE.

Type de document: Article
Mots-clés libres: RFID RH sensing screen-printing TOCN/PPy aromatic compounds cellulose nanocrystals composite structures coplanar waveguides economic and social effects electric lines microwave frequencies coplanar wave-guide (CPW) humidity sensitive insertion phase phase sensitivity printing technologies sensing schemes signal attenuation TEMPO-oxidized cellulose nanofibers microwave sensors frequency humidity insertion phases sensitivity thickness transmission Lines
Date de dépôt: 01 juill. 2021 12:18
Dernière modification: 01 juill. 2021 12:18
Version du document déposé: Post-print (version corrigée et acceptée)

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