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. 2018 Nov 16;18(11):4005. doi: 10.3390/s18114005

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© 2018 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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Relationship between (a) resonance frequency f_r and permittivity $ε_{r}^{'}$ of LUT and (b) 3-dB bandwidth f_b and tan $θ$ of LUT.