Ultralow Reflectivity Spiral Phase Plate for Generation of Millimeter-wave OAM Beam

An ultralow reflectivity spiral phase plate (SPP) is proposed to generate an orbital angular momentum (OAM) beam at millimeter-wave frequency. The SPP is composed of unit cells whose equivalent permittivity and thickness are designed to satisfy the impedance matching condition based on transmission...

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Published in:IEEE antennas and wireless propagation letters 2015-01, Vol.14, p.966-969
Main Authors: Hui, Xiaonan, Zheng, Shilie, Hu, Yiping, Xu, Chen, Jin, Xiaofeng, Chi, Hao, Zhang, Xianmin
Format: Article
Language:English
Subjects:
Antenna measurements
Impedance matching
millimeter-wave
orbital angular momentum (OAM)
Permittivity
Phase measurement
Reflection
Reflectivity
spiral phase plate (SPP)
Spirals
transmission line theory
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creator Hui, Xiaonan
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description An ultralow reflectivity spiral phase plate (SPP) is proposed to generate an orbital angular momentum (OAM) beam at millimeter-wave frequency. The SPP is composed of unit cells whose equivalent permittivity and thickness are designed to satisfy the impedance matching condition based on transmission line theory. The designed SPP is fabricated by a 3D printing technique. The near-field and far-field phase distributions clearly exhibit the azimuth phase shifting, and the far field directivity pattern shows that the direction, gain, and 3-dB beam-width of the main lobe are about 10.5°, 14.6 dB, and 14.5°, respectively. Compared with no impedance-matched SPP, the reflectivity of the SPP is improved by more than 20 dB.
doi_str_mv 10.1109/LAWP.2014.2387431
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source IEEE Electronic Library (IEL) Journals
subjects Antenna measurements
Impedance matching
millimeter-wave
orbital angular momentum (OAM)
Permittivity
Phase measurement
Reflection
Reflectivity
spiral phase plate (SPP)
Spirals
transmission line theory
title Ultralow Reflectivity Spiral Phase Plate for Generation of Millimeter-wave OAM Beam
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