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    Area of Science:

    • Antenna Engineering
    • Electromagnetics
    • Optics

    Background:

    • Non-diffracting Bessel beams offer unique propagation characteristics.
    • Traditional Bessel beam generation methods can be complex and bulky.
    • Reflectarray antennas provide a planar and integrated solution for beam shaping.

    Purpose of the Study:

    • To propose a highly integrated reflection-type approach for generating non-diffracting Bessel beams.
    • To demonstrate the capability of a source-integrated folded reflectarray antenna (FRA) for Bessel beam generation.
    • To validate the proposed FRA design through theoretical analysis, simulation, and experimental measurement.

    Main Methods:

    • Designing a source-integrated folded reflectarray antenna (FRA).
    • Specifying the phase distribution of reflectarray elements to generate Bessel beams.
    • Analyzing, simulating, and experimentally measuring a millimeter-wave Bessel beam generator and a collimated beam structure.

    Main Results:

    • The proposed FRA successfully transforms spherical waves to conical waves and directly produces Bessel beams.
    • Good agreement was observed between theoretical analysis, full-wave simulation, and experimental results.
    • The reflectarray elements were fully integrated with the feeding source on a single-layered printed circuit board.

    Conclusions:

    • The developed FRA is an effective and integrated solution for generating non-diffracting Bessel beams.
    • The proposed approach offers a low-cost and simplified method for Bessel beam generation.
    • This technology has potential applications in areas requiring directed energy or specialized beam propagation.