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Article

Broadband Flexible Metasurface for SAR Imaging Cloaking

by
Bo Yang
1,2,3,4,†,
Hui Jin
1,2,3,*,†,
Chaobiao Chen
1,2,3,
Peixuan Zhu
1,2,3,
Siqi Zhang
1,2,3,
Rongrong Zhu
5,
Bin Zheng
1,2,3,* and
Huan Lu
1,2,3
1
State Key Laboratory of Extreme Photonics and Instrumentation, ZJU-Hangzhou Global Scientific and Technological Innovation Center, Zhejiang University, Hangzhou 310027, China
2
International Joint Innovation Center, The Electromagnetics Academy at Zhejiang University, Zhejiang University, Haining 314400, China
3
Zhejiang Key Laboratory of Intelligent Electromagnetic Control and Advanced Electronic Integration, Jinhua Institute of Zhejiang University, Zhejiang University, Jinhua 321099, China
4
Sussex Artificial Intelligence Institute, Zhejiang Gongshang University, Hangzhou 310018, China
5
School of Information and Electrical Engineering, Hangzhou City University, Hangzhou 310015, China
*
Authors to whom correspondence should be addressed.
†
These authors contributed equally to this work.
Materials 2025, 18(17), 3969; https://doi.org/10.3390/ma18173969
Submission received: 20 July 2025 / Revised: 14 August 2025 / Accepted: 22 August 2025 / Published: 25 August 2025
(This article belongs to the Special Issue Advances in Metamaterials: Structure, Properties and Applications—Second Edition)
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Abstract

Most electromagnetic invisibility devices are designed while relying on rigid structures, which have limitations in adapting to complex curved surfaces and dynamic deployment. In contrast, flexible invisibility structures have great application value due to their bendable and easy-to-fit characteristics. In this paper, we propose a flexible metasurface suitable for broadband SAR (Synthetic Aperture Radar) imaging invisibility, which realizes multi-domain joint regulation of electromagnetic waves by designing two subwavelength unit structures with differentiated reflection characteristics and combining array inverse optimization methods. The metasurface employs a sponge-like dielectric substrate and integrates resistive ink to construct a resonant structure, which can suppress electromagnetic scattering through joint phase and amplitude modulation, achieving low detectability of targets in UAV (Unmanned Aerial Vehicle) detection scenarios. Indoor microwave anechoic chamber tests and outdoor UAV-borne SAR experiments verify its stable invisibility performance in a wide frequency band, providing theoretical and experimental support for the application of flexible metasurfaces in dynamic electromagnetic detection countermeasures.
Keywords: metasurface; flexible materials; SAR imaging cloak metasurface; flexible materials; SAR imaging cloak

Share and Cite

MDPI and ACS Style

Yang, B.; Jin, H.; Chen, C.; Zhu, P.; Zhang, S.; Zhu, R.; Zheng, B.; Lu, H. Broadband Flexible Metasurface for SAR Imaging Cloaking. Materials 2025, 18, 3969. https://doi.org/10.3390/ma18173969

AMA Style

Yang B, Jin H, Chen C, Zhu P, Zhang S, Zhu R, Zheng B, Lu H. Broadband Flexible Metasurface for SAR Imaging Cloaking. Materials. 2025; 18(17):3969. https://doi.org/10.3390/ma18173969

Chicago/Turabian Style

Yang, Bo, Hui Jin, Chaobiao Chen, Peixuan Zhu, Siqi Zhang, Rongrong Zhu, Bin Zheng, and Huan Lu. 2025. "Broadband Flexible Metasurface for SAR Imaging Cloaking" Materials 18, no. 17: 3969. https://doi.org/10.3390/ma18173969

APA Style

Yang, B., Jin, H., Chen, C., Zhu, P., Zhang, S., Zhu, R., Zheng, B., & Lu, H. (2025). Broadband Flexible Metasurface for SAR Imaging Cloaking. Materials, 18(17), 3969. https://doi.org/10.3390/ma18173969

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