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    This study introduces a novel 2-bit coding metasurface that achieves polarization conversion and radiation. This multifunctional metasurface shows promise for advanced radar and satellite communication systems.

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    Area of Science:

    • Metamaterials and Nanophotonics
    • Electromagnetics and Wave Propagation

    Background:

    • Conventional polarization conversion metasurfaces often require complex orthogonal grating structures.
    • Achieving simultaneous polarization conversion and radiation in a single metasurface presents a design challenge.

    Purpose of the Study:

    • To propose and demonstrate a novel transmission-type 2-bit coding metasurface with integrated radiation capabilities.
    • To enable efficient polarization conversion and beam steering using a simplified parallel grating design.

    Main Methods:

    • Design of a two-layer metasurface featuring parallel grating structures for spoof surface plasmon polaritons (SSPPs) propagation.
    • Periodic modulation of surface impedance by tuning grating parameters to control SSPP radiation.
    • Simultaneous realization of polarization conversion at 6.2 GHz and beam radiation between 2.7-4.7 GHz.

    Main Results:

    • The proposed metasurface achieves polarization conversion with a transmission efficiency of 90%.
    • Radiation characteristics are observed in the 2.7-4.7 GHz range, with a scanning angle from -36° to 41° and an average gain of 10.0 dBi.
    • The design maintains high polarization conversion efficiency while enabling controlled radiation.

    Conclusions:

    • The developed multifunctional transmission-type coding metasurface offers a unique combination of polarization conversion and radiation.
    • The parallel grating design simplifies fabrication and enables efficient spoof surface plasmon polaritons propagation and radiation.
    • This technology holds significant potential for compact radar and satellite communication systems.