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. 2009 Apr 22;9(4):2951–2967. doi: 10.3390/s90402951

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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 7. — Measuring equipment for the ‘Free Line Sensor’ with a HP3588B vector network analyser, HP35677A S-parameter test set and personal computer. The meaning of the S-parameters is shown on the right; the measuring parameter is the input reflection factor S₁₁ = b₁ / a₁.