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Open AccessFeature PaperArticle

Planar Microstrip Ring Resonators for Microwave-Based Gas Sensing: Design Aspects and Initial Transducers for Humidity and Ammonia Sensing

Department of Functional Materials, University of Bayreuth, 95447 Bayreuth, Germany
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Sensors 2017, 17(10), 2422; https://doi.org/10.3390/s17102422
Received: 21 September 2017 / Revised: 16 October 2017 / Accepted: 17 October 2017 / Published: 24 October 2017
(This article belongs to the Collection Gas Sensors)
A planar microstrip ring resonator structure on alumina was developed using the commercial FEM software COMSOL. Design parameters were evaluated, eventually leading to an optimized design of a miniaturized microwave gas sensor. The sensor was covered with a zeolite film. The device was successfully operated at around 8.5 GHz at room temperature as a humidity sensor. In the next step, an additional planar heater will be included on the reverse side of the resonator structure to allow for testing of gas-sensitive materials under sensor conditions. View Full-Text
Keywords: microwave cavity perturbation; resonant frequency; radio frequency based gas sensors; zeolites; in operando spectroscopy microwave cavity perturbation; resonant frequency; radio frequency based gas sensors; zeolites; in operando spectroscopy
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MDPI and ACS Style

Bogner, A.; Steiner, C.; Walter, S.; Kita, J.; Hagen, G.; Moos, R. Planar Microstrip Ring Resonators for Microwave-Based Gas Sensing: Design Aspects and Initial Transducers for Humidity and Ammonia Sensing. Sensors 2017, 17, 2422.

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