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. 2024 Aug 24;16(17):2405. doi: 10.3390/polym16172405

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© 2024 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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(a) Model diagram. Two layering methods: constant thickness layering (b) and constant impedance layering (c). The absorption coefficient (d) and reflection coefficient (e) simulated by the two methods. Reproduced with permission from [67]. Copyright © 2021, Elsevier. An acoustic cloak is designed based on a coordinate transformation method (f), which has good stealth performance (g) and high transmission efficiency (h). Reproduced with permission from [68]. Copyright © 2021, Springer Nature.