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. 2023 Jan 30;14(2):349. doi: 10.3390/mi14020349

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© 2023 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/).

PMC Copyright notice

Schematics of the antenna in [27] with metamaterial to improve bandwidth. (a) Metamaterial structure, (b) S-parameters of the antenna, (c) fabricated prototype, (d) S-parameter phase. Reprinted from Ref. [27].