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. 2020 Nov 9;20(21):6392. doi: 10.3390/s20216392

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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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Frequency spectra of: (a) absolute impedance $|{\dot{Z}}_{A}|$ ; (b) phase $θ_{ZA}$ ; (c) absolute impedance $|{\dot{Z}}_{X}|$ ; and (d) phase $θ_{ZX}$ at $(2 m - 1) f_{0}$ ( $m = 1, 2, 3, \dots, 20$ ) Hz.