基于稀疏馈电阵列的增强型无衍射OAM波束生成的超低剖面超表面
An Ultra-Low Profile Metasurface for Enhanced Non-Diffractive OAM Beam Generation Based on Sparse Feed Array
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中文总结 AI 辅助
该研究提出一种基于稀疏馈电阵列的超低剖面超表面，通过整合多类相位生成模式l=+2的OAM无衍射波束，相比传统方案波束发散度更小、增益更高，兼具高孔径效率等优势。
中文摘要 AI 辅助
本文提出一种新型超低剖面透射式超表面，用于生成增强型无衍射轨道角动量（OAM）波束，首次采用稀疏馈电阵列（SFA）产生准平面波激励。仿真表明，采用均匀幅度激励时，该超表面生成的贝塞尔波束无衍射性能优于传统单馈激励。基于此原理，引入5×5稀疏馈电阵列并将其置于距超表面小于1个波长的位置，确保所有单元获得准均匀幅度激励。该超表面利用其灵活的相位控制能力，整合空间相位、OAM相位和轴锥相位，生成增强型高阶贝塞尔波束。仿真结果证实，成功生成携带模式l=+2的OAM的无衍射贝塞尔波束，表现出更小的波束发散度和更高的增益。该设计还具备超低剖面、高孔径效率、低结构复杂度的优势。
英文摘要
This paper proposes a novel ultra-low profile transmitted metasurface to generate enhanced non-diffractive orbital angular momentum (OAM) beams, employing a sparse feed array (SFA) to create a quasi-plane wave excitation for the first time. Our simulation indicates that with uniform amplitude excitation, the non-diffraction performance of Bessel beam produced by metasurface, surpasses that of conventional single-feed excitation. Based on this principle, a 5 * 5 sparse feed array is introduced and positioned less than one wavelength from the metasurface, ensuring a quasi-uniform amplitude excitation across all units. Further, this metasurface leverages its flexible phase control capability and integrates the spatial phase, OAM phase, and axicon phase to generate an enhanced high-order Bessel beam. The simulated results confirm a successful non-diffractive Bessel beam generation carrying OAM with mode l = +2, exhibiting reduced beam divergence and higher gain. This design also offers benefits of ultra-low profile, high aperture efficiency, low structural complexity.
