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Electromagnetic waves can travel in the vacuum as well as in matter. For example light, which is an electromagnetic wave, can travel through air, water, or glass.
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Multi-bit dielectric coding metasurface for EM wave manipulation and anomalous reflection.

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    Area of Science:

    • Electromagnetic Metasurfaces
    • Wave Scattering Control
    • Anomalous Reflection

    Background:

    • Metasurfaces offer precise control over electromagnetic (EM) wave properties.
    • Developing multi-bit coding metasurfaces enhances control granularity for EM wave manipulation.

    Purpose of the Study:

    • To present a multi-bit dielectric reflective metasurface for precise control of EM wave scattering and anomalous reflection.
    • To demonstrate the metasurface's capability for radar cross-section reduction.

    Main Methods:

    • Unit cell design for 1-, 2-, and 3-bit coding metasurfaces.
    • Utilizing high permittivity material for a high Q factor.
    • Employing the discrete water cycle algorithm for optimal coding matrix generation.

    Main Results:

    • The 3-bit metasurface exhibits eight distinct phase states (0° to 315°).
    • Achieved over 93% power efficiency for anomalous reflection.
    • Demonstrated diffusion-like scattering for radar cross-section reduction.

    Conclusions:

    • The proposed multi-bit coding metasurface effectively controls EM wave scattering and anomalous reflection.
    • The metasurface is a promising candidate for applications requiring precise EM wave manipulation.
    • Simulation and experimental results validate the metasurface's performance.