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Phase-modulation based transmitarray convergence lens for vortex wave carrying orbital angular momentum.

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    This study introduces a metasurface (MS) lens to focus vortex electromagnetic (EM) waves, overcoming divergence issues for enhanced wireless communication. The novel lens improves propagation directivity and gain for orbital angular momentum (OAM) beams.

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    Area of Science:

    • Electromagnetism
    • Metamaterials
    • Wireless Communication

    Background:

    • Vortex electromagnetic (EM) waves offer increased transmission capacity in wireless systems due to orbital angular momentum (OAM).
    • The divergence of vortex EM waves limits their application in long-distance wireless communication.

    Purpose of the Study:

    • To propose a metasurface (MS) based lens for converging vortex EM waves.
    • To enhance the propagation performance of vortex EM waves at microwave frequencies.

    Main Methods:

    • Designed a phase-modulation metasurface (MS) lens.
    • Utilized the concept of an optical converging axicon to determine the phase-shift distribution.
    • Simulated the focusing of vortex EM waves, converting Laguerre-Gaussian (LG) beams to Bessel beams.

    Main Results:

    • The MS lens successfully achieved OAM beam focusing.
    • Demonstrated enhanced propagation directivity for vortex EM waves.
    • Showcased increased gain in the main lobes of the focused vortex waves.

    Conclusions:

    • The proposed MS lens effectively converges vortex EM waves, improving their propagation.
    • This technology is crucial for advancing microwave wireless communication applications by enhancing signal directivity and gain.