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    This study introduces an active metasurface that amplifies polarization conversion in microwave frequencies, overcoming energy loss issues. This technology offers enhanced performance for future wireless communication systems.

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    Area of Science:

    • Metamaterials and Nanophotonics
    • Electromagnetics and Microwave Engineering

    Background:

    • Reconfigurable polarization-manipulation metasurfaces are valuable for adaptive electromagnetic control.
    • Ohmic losses in active metasurfaces limit their output energy, especially in the microwave spectrum.

    Purpose of the Study:

    • To propose and demonstrate an active polarization-converting metasurface that overcomes inherent energy loss.
    • To develop a design strategy for a non-reciprocal polarizer with energy amplification.

    Main Methods:

    • Integration of amplifying transistors into a polarization-converting metasurface design.
    • Experimental validation in the microwave region to measure polarization conversion and amplification.

    Main Results:

    • Demonstration of an active metasurface with non-reciprocal polarization responses.
    • Observed amplification of polarization-converting behaviors around 3.95 GHz.
    • Successful design of a polarization-insensitive polarizer with energy amplification.

    Conclusions:

    • The proposed active metasurface effectively mitigates ohmic losses and amplifies polarization conversion.
    • This technology holds significant promise for advanced wireless communication applications.
    • Potential applications include spatial isolation, signal enhancement, and electromagnetic environment shaping.