This work presents the design of a metasurface-based Bessel beam launcher in Ka-band. The launcher uses a modulated metasurface to generate the non-diffractive beam in its near-field. The key advantage of the proposed structure is the large non-diffractive range. The radial size of launcher rises up to <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">9.95λ</tex> , while the axicon angle decreases to <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">θα=5ᵒ</tex> to achieve the high non-diffractive range. Full-wave numerical results validate the operation of the systems.
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Paschaloudis et al. (2024) studied this question.
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