空间分集入射电磁波的高效轨道角动量复用传输

High-efficiency Orbital Angular Momentum Multiplexing Transmissionfor Spatial Diversity Incident Electromagnetic Wave

中文关键词:  轨道角动量  超表面  角域色散  复用  空间分集

英文关键词:orbital angular momentum  metasurface  angular dispersion  multiplexing  spatial diversity

中文摘要:

      电磁波的轨道角动量(OAM)复用对高速无线通信具有重要意义。为了实现空间分集入射电磁波的高效OAM 复用,文中提出了一种非对称式超表面单元结构,在不同入射角度下具有OAM 复用所需的角域色散相位响应和高透射 率。基于此单元结构构建了一种工作于X波段的OAM复用超表面,通过仿真和实验验证了其对±45°入射电磁波分别可 以实现l=±2模式的OAM 复用传输。与现有的OAM复用超表面相比,该超表面能够转换更多的能量而不会产生其他透 射方向的寄生OAM波束,从而显著提高了空间分集入射电磁波的OAM复用传输效率。

英文摘要:

      Orbital angular momentum (OAM) multiplexing of electromagnetic (EM) wave is of great significance for highspeed wireless communication. To achieve high-efficient OAM multiplexing for spatial diversity incident EM wave, in this paper a novel asymmetric meta-atom structure is presented, which can introduce the required angular dispersion phase response as well as high transmission efficiency for OAM multiplexing at different incidence angles. These meta-atoms are then arranged accordingly to form a metasurface working at X band, whose OAM multiplexing performance with l =±2 modes under ±45° incidence are demonstrated by simulation and experiment results. Compared to the conventional OAM multiplexing metasurfaces, the proposed metasurface can convert higher proportion of energy to the required OAM modes without parasitic OAM beams towards other directions, which can significantly improve the OAM multiplexing efficiency for spatial diversity incident EM wave.