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Area of Science:

  • Electromagnetics
  • Materials Science
  • Metasurface Technology

Background:

  • Traditional electromagnetic invisibility devices often use rigid structures, limiting their adaptability to curved surfaces and dynamic applications.
  • Flexible invisibility structures offer significant advantages due to their conformability and ease of deployment.

Purpose of the Study:

  • To propose and demonstrate a flexible metasurface for broadband Synthetic Aperture Radar (SAR) imaging invisibility.
  • To achieve multi-domain joint regulation of electromagnetic waves for enhanced stealth.

Main Methods:

  • Design of two subwavelength unit structures with distinct reflection characteristics.
  • Application of array inverse optimization methods for metasurface design.
  • Integration of a sponge-like dielectric substrate with resistive ink to create a resonant structure.

Main Results:

  • The flexible metasurface effectively suppresses electromagnetic scattering through joint phase and amplitude modulation.
  • Achieved low detectability for targets in Unmanned Aerial Vehicle (UAV) detection scenarios.
  • Demonstrated stable invisibility performance across a wide frequency band in both indoor and outdoor experiments.

Conclusions:

  • The developed flexible metasurface provides a viable solution for broadband SAR invisibility.
  • Offers theoretical and experimental support for the application of flexible metasurfaces in dynamic electromagnetic detection countermeasures.
  • Highlights the potential for advanced stealth technologies in modern surveillance environments.