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. 2021 Jul 20;11:14775. doi: 10.1038/s41598-021-94139-y

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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(a) Modelled one port split ring resonator in High-Frequency Structure Simulator (HFSS). (b) Magnetic field distribution on the resonator. (c) Electric field distribution on the resonator with the sensitive zone found in the ring gap. (d) Simulated vs measured reflection coefficient of the sensor in the absence and presence of a sample under test (SUT) on the sensitive region of the resonator. Impact of variation in (e) permittivity and (f) loss tangent of the SUT on the resonant amplitude and resonant frequency of the resonator.