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

• 作者: He Wang Yong-Feng Li Shao-Bo Qu
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2021,（8）
• 所属期刊栏目: ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS
• 页码范围: 380-388
• 页数: 9页
• 语种: 英文
• DOI: 10.1088/1674-1056/abe37c

摘要

Vortex beams carrying orbital angular momentum (OAM) have aroused great interest of both scientific and engi-neering 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 car-rying different topological charges in the same frequency band,which may have potential applications in communication systems.