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. 2009 Jul 20;9(7):5740–5769. doi: 10.3390/s90705740

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© 2009 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 license (http://creativecommons.org/licenses/by/3.0/).

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Figure 8. — (a) Oscillator circuit provides a single-frequency signal. (b)Vector voltmeter provides phase and amplitude. (c) Network analyzers are connected to one and two-port devices. M: matching network [29].