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. 2018 May 9;18(5):1492. doi: 10.3390/s18051492

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© 2018 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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The output power area ratio $γ$ along with different $D_{1}$ and $K_{1}$ of the NPEHS-1: (a) Top view; (b) oblique view.