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. 2019 Jan 25;19(3):498. doi: 10.3390/s19030498

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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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Simulated sensitivity comparison of the four permittivity sensors: (a) frequency shift (Δf_r (GHz)); (b) percent relative frequency shift (Δf_r/f_r (%)); (c) sensitivity(Δf_r/Δε_r (GHz)); (d) sensitivity enhancement compared to the DR-CSRR-based sensor.

Simulated sensitivity comparison of the four permittivity sensors: (a) frequency shift (Δf_r (GHz)); (b) percent relative frequency shift (Δf_r/f_r (%)); (c) sensitivity(Δf_r/Δε_r (GHz)); (d) sensitivity enhancement compared to the DR-CSRR-based sensor.