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Angle-insensitive broadband transparent microwave absorber with high shielding effectiveness.

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    This study presents a novel multilayer indium tin oxide (ITO) metasurface absorber. It offers broadband absorption and high shielding effectiveness (SE) across wide angles, ideal for advanced applications.

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    Area of Science:

    • Electromagnetics and Metamaterials
    • Materials Science
    • Microwave Engineering

    Background:

    • Metasurfaces offer unique electromagnetic properties.
    • Broadband absorption and high shielding effectiveness (SE) are crucial for many applications.
    • Existing microwave absorbers often struggle with angle sensitivity and miniaturization.

    Purpose of the Study:

    • To design and demonstrate a novel multilayer ITO metasurface absorber.
    • To achieve angle-insensitive, ultra-broadband absorption with high SE.
    • To miniaturize the absorber while maintaining performance.

    Main Methods:

    • Designed a multilayer ITO mesh structure metasurface with gradually changing surface resistance.
    • Incorporated a folded square ring metasurface to suppress grating lobes and reduce unit size.
    • Added a top dielectric layer for stability under oblique incidence.

    Main Results:

    • Achieved >80% absorption in the 2.10-14.65 GHz band (150% relative bandwidth).
    • Obtained SE >20 dB in the 1-12 GHz band at normal incidence.
    • Demonstrated angle-insensitive performance up to 45°.
    • Resulting absorber is ultra-broadband, miniaturized, and transparent.

    Conclusions:

    • The proposed ITO metasurface absorber exhibits excellent angle-insensitive, ultra-wideband absorption and high SE.
    • The design effectively addresses bandwidth limitations, angle sensitivity, and size constraints.
    • This work implies broad applicability in various electromagnetic shielding and absorption scenarios.