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Ultra-wideband RCS reduction based on coupling effects between beam diffuse and absorptive structures.

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    This summary is machine-generated.

    This study introduces a novel hybrid metasurface design for broadband radar cross section (RCS) reduction. The innovative approach combines diffuse and absorptive elements to significantly enhance RCS reduction bandwidth.

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    Area of Science:

    • Electromagnetics and Metamaterials
    • Advanced Materials Science
    • Radar Technology

    Background:

    • Traditional radar cross section (RCS) reduction techniques often face limitations in achieving broadband performance.
    • Existing diffuse and absorptive methods have inherent bandwidth constraints.
    • Metasurfaces offer promising avenues for tailored electromagnetic wave manipulation.

    Purpose of the Study:

    • To propose and demonstrate a hybrid design method for ultra-wideband RCS reduction.
    • To investigate the synergistic effects between diffuse and absorptive structures in a metasurface.
    • To achieve significant RCS reduction over a broad frequency range with a lightweight design.

    Main Methods:

    • A one-bit diffuse coding metasurface (CM) utilizing a two-layer resistive frequency selective surface (RFSS) was designed.
    • The method leverages coupling effects between metallic patterns and RFSS for enhanced absorption and diffusion.
    • Fabrication, analysis, simulation, and measurement of a lightweight CM loaded with RFSS were performed.

    Main Results:

    • The hybrid metasurface achieved a 10 dB RCS reduction in an ultra-wideband from 7.3 to 44.2 GHz (143.3% fractional bandwidth).
    • The proposed mechanism effectively breaks traditional bandwidth limitations of diffusion and absorption methods.
    • The metasurface demonstrated robust performance under wide-angle oblique incidences.

    Conclusions:

    • The developed hybrid metasurface design offers a viable solution for ultra-wideband RCS reduction.
    • The coupling effect between diffuse and absorptive elements is crucial for broadening the operational bandwidth.
    • This lightweight design provides a new strategy for enhancing frequency band coverage in electromagnetic wave manipulation applications.