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. 2022 May 10;22(10):3633. doi: 10.3390/s22103633

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© 2022 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 (https://creativecommons.org/licenses/by/4.0/).

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Directivity results for a sweep in parameters for the cylindrical GP. (a) Directivity for different cylindrical GP diameters and optimum height ( $h = 0.25 λ$ ). (b) Directivity for different cylindrical GP heights and optimum diameter ( $d_{g p} = λ$ ).