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Correction published on 24 December 2016, see Sensors 2017, 17(1), 29.

Open AccessArticle
Sensors 2016, 16(11), 1829;

Microwave Chemical Sensor Using Substrate-Integrated-Waveguide Cavity

School of Electrical and Electronics Engineering, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 156-756, Korea
Author to whom correspondence should be addressed.
Academic Editors: Changzhi Li, Roberto Gómez-García and José-María Muñoz-Ferreras
Received: 16 August 2016 / Revised: 10 October 2016 / Accepted: 27 October 2016 / Published: 31 October 2016
(This article belongs to the Special Issue Non-Contact Sensing)
Full-Text   |   PDF [3352 KB, uploaded 4 January 2017]   |  


This research proposes a substrate-integrated waveguide (SIW) cavity sensor to detect several chemicals using the microwave frequency range. The frequency response of the presented SIW sensor is switched by filling a very small quantity of chemical inside of the fluidic channel, which also causes a difference in the effective permittivity. The fluidic channel on this structure is either empty or filled with a chemical; when it is empty the structure resonates at 17.08 GHz. There is always a different resonant frequency when any chemical is injected into the fluidic channel. The maximum amount of chemical after injection is held in the center of the SIW structure, which has the maximum magnitude of the electric field distribution. Thus, the objective of sensing chemicals in this research is achieved by perturbing the electric fields of the SIW structure. View Full-Text
Keywords: SIW; fluidics; chemical sensor; multilayer cavity; ethanol SIW; fluidics; chemical sensor; multilayer cavity; ethanol

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Memon, M.U.; Lim, S. Microwave Chemical Sensor Using Substrate-Integrated-Waveguide Cavity. Sensors 2016, 16, 1829.

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