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. 2020 Jan 1;20(1):255. doi: 10.3390/s20010255

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© 2020 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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Reflection coefficient, S₁₁ (dB), results for different (MUT) relative permittivity’s values at resonant frequencies (a) $f r_{1}$ and (b) $f r_{2}$ .