Shared aperture metasurface antenna for electromagnetic vortices generation with different topological charges  

作　　者：He Wang Yong-Feng Li Shao-Bo Qu 王贺;李勇峰;屈绍波(Department of Basic Sciences,Air Force Engineering University,Xi'an 710051,China)

机构地区：[1]Department of Basic Sciences,Air Force Engineering University,Xi'an 710051,China

出　　处：《Chinese Physics B》2021年第8期337-344,共8页中国物理B（英文版）

基　　金：Project supported by the National Natural Science foundation of China(Grant No.61971347).

摘　　要：Vortex beams carrying orbital angular momentum(OAM)have aroused great interest of both scientific and engineering communities.Encouragingly,generating OAM with different topological charges in a shared aperture is regarded as a potential route to expanding the communication capacity,which yet is an academic challenging task.In this work,a paradigm of designing metasurface-based shared aperture antenna for generating polarization-dependent vortex beams with distinct topological charges is proposed.Anisotropic unit cells that can tailor different resonance phase profiles in two orthogonal orientations are used to assemble a metasurface reflector.As a proof-of-concept,a planar reflector antenna is designed with two Vivaldi sources,which can generate x-and y-polarized vortex beams with topological charges of l=-1 and l=-2,respectively.Both the simulation results and the measurement results are in good agreement,which demonstrates the feasibility of our design.Significantly,this work provides a new route to achieving vortex beams carrying different topological charges in the same frequency band,which may have potential applications in communication systems.

关 键 词：metasurface electromagnetic vortex ANTENNA orbital angular momentum 

分 类 号：O469[理学—凝聚态物理]