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. 2020 Apr 30;3:62. doi: 10.1038/s41746-020-0270-2

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© The Author(s) 2020

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — a Flow diagram for sensor fabrication with side view showing layer build up. b Bode plot showing the effect of different dielectric media on the resonator’s transmission loss. Resonator was attached to bottom of petri-dish with 10 mL of liquid for all trials. c Experimental setup for characterization of sensor using a syringe pump to fill channels with a custom reader, scale bar = 2 cm. d Custom reader setup including 3D printed holder, double loop interrogation antenna, and portable VNA (MetroVNA).