Conical beams have potential uses in wireless and satellite-based communication. In this study, we propose a method using a transmissive metasurface to achieve full control of the diverging effect of orbital angular momentum (OAM) modes to form the desired conical beam. A patch antenna functioning as the feed source is combined with the transmissive metasurface to enable the integration of the source and metasurface. For full control of conical radiation, including the cone angle and OAM mode, we introduce both radial and circumferential phase gradients to the proposed metasurface. Experiments are conducted in the microwave region to validate the design method, which shows good agreement with the simulation results. The proposed metasurface provides a means of flexibly generating conical beams with the designed OAM mode to assist potential applications in high-speed wireless communication.

中文翻译：

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用透射超表面控制承载轨道角动量的锥形光束

锥形波束在无线和卫星通信中具有潜在用途。在这项研究中，我们提出了一种使用透射超表面的方法来实现对轨道角动量（OAM）模式的发散效应的完全控制，以形成所需的锥形光束。用作馈源的贴片天线与透射超表面相结合，以实现源和超表面的集成。为了完全控制锥形辐射，包括锥角和 OAM 模式，我们将径向和圆周相位梯度引入了所提出的超表面。在微波区域进行了实验以验证设计方法，结果与仿真结果吻合良好。