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. 2019 May 7;19(9):2100. doi: 10.3390/s19092100

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Relative permittivity of MUT versus resonance frequency of the sensor obtained by Electromagnetic (EM) simulation and VNA measurement. Relative permittivity of MUT is inversely proportional to the resonance frequency of sensor.