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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/).

PMC Copyright notice

(a) Experimental device diagram. (b) The schematic diagram of the acoustic waveguide based on the coordinate transformation. (c) The experimental results of the acoustic waveguide at 20 kHz. Reproduced with permission from [75]. Copyright © 2022, Frontiers. (d) Acoustic cloak structure. (e) Simulation and experimental results of acoustic cloak stealth performance at 9–15 kHz. Reproduced with permission from [76]. Copyright © 2017, APS Publishing. (f) A coordinate transformation method. (g) Design the parameters of acoustic cloak materials by changing the density and modulus. (h) Stealth performance. Reproduced with permission from [77]. Copyright © 2022, MDPI Publishing.