A Small-Divergence-Angle Orbital Angular Momentum Metasurface Antenna
1State Key Laboratory of Information Photonics and Optical Communications, School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China
2Beijing University of Posts and Telecommunications Research Institute, Shenzhen 518057, China
3Beijing Key Laboratory of Space-Ground Interconnection and Convergence, Beijing University of Posts and Telecommunications, Beijing 100876, China
4School of Computer Science and Electronic Engineering, University of Essex, Colchester CO4 3SQ, UK
5Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan 250061, China
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