Metasurfaces, orbital angular momenta (OAM), and non-diffractive Bessel beams have been attracting worldwide research. Combining the benefits of these three promising techniques, this paper proposes a metasurface-based reflective-type approach to generate a first-order Bessel beam carrying OAM. To validate this approach, a millimeter-wave metasurface is analyzed, designed, fabricated, and measured. Experimental results agree well with simulation. Moreover, this reflective-type metasurface, generating a Bessel beam with OAM, is inherently integrated with a planar feeding source in the same single-layer printed circuit board. Therefore, the proposed design features low profile, low cost, easy integration with front-end active circuits, and no alignment error between the feeding source and the metasurface.
In this paper, the antenna-radome system in millimeter wave band is analyzed by the aperture integration-surface integration (AI-SI) method. When the electromagnetic wave passes through the radome, the transmission coefficient is determined by the transmission line analogy. However, the conventional transmission coefficient always ignores the phase factor of the lateral transmission in the dielectric. In the present work, the modified transmission coefficient is proposed and verified by both the theoretical derivation and the experimental measurement. The measured results of the antenna-radome systems at W-band show that the modified transmission coefficient is more accurate than the conventional one in the antenna-radome analysis.
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