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    This study introduces an ultra-thin, dual-band tunable metasurface absorber. It offers wide-range, independent control of microwave absorption frequencies, crucial for intelligent stealth systems.

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    Area of Science:

    • Metamaterials and Nanophotonics
    • Electromagnetics and Microwave Engineering

    Background:

    • Active metasurface absorbers offer tunable microwave absorption for intelligent stealth.
    • Achieving dual-band dynamic absorption with a wide tuning range in ultra-thin profiles remains a challenge.

    Purpose of the Study:

    • To propose and demonstrate a dual-band tunable ultra-thin metasurface absorber.
    • To achieve polarization- and angle-insensitive absorption with independent frequency tuning.

    Main Methods:

    • Utilizing varactor diodes for voltage-controlled tuning of absorption bands.
    • Designing symmetrical structures for polarization and angle insensitivity.
    • Fabricating and simulating an ultra-thin metasurface absorber on a dielectric substrate.

    Main Results:

    • Demonstrated continuous and independent tuning of two absorption bands over a wide range.
    • Achieved polarization insensitivity within ±30° incidence.
    • Maintained over 99% absorption with an ultra-thin profile (0.0126λL).
    • Experimental results validated simulation predictions.

    Conclusions:

    • The proposed active metasurface absorber is feasible and effective.
    • It offers significant potential for applications in military stealth and radar systems.
    • This work advances the development of intelligent electromagnetic devices.