期刊
IEEE ACCESS
卷 7, 期 -, 页码 71963-71971出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2019.2919779
关键词
Orbital angular momentum (OAM); reflective metasurface; radiation performance; vortex beam
资金
- Opening Project of Guangxi College Key Laboratory of Microwave and Optical wave Applications Technology [MLLAB2017001]
In this paper, high-order orbital angular momentum (OAM) vortex beams (OAMVBs) are generated using reflective metasurface. Generating high-order OAMVBs using traditional reflective metasurface methods deteriorates the radiation performance that affects the mode purity of OAMVBs. A reflective metasurface is proposed to generate the OAMVBs with l = 4 mode at the designed frequency of 6 GHz. It is revealed that the radiation performance has been improved and mode purity for l = 4 is increased 12.6% by using quarter wavelength unit cell and circular aperture metasurface as compared to the conventional metasurface at the designed frequency. Moreover, the reflective metasurface can generate the OAMVBs with l = 4 mode from 5 GHz to 7.5 GHz. The measured gain is 17.93 dBi which agrees well with the simulated gain.
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