Journal
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
Volume 14, Issue -, Pages 966-969Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LAWP.2014.2387431
Keywords
Impedance matching; millimeter-wave; orbital angular momentum (OAM); spiral phase plate (SPP); transmission line theory
Funding
- National Basic Research Program of China (973 Program) [2014CB340005, 2014CB340001]
- National Natural Science Foundation of China [61371030]
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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 degrees, 14.6 dB, and 14.5 degrees, respectively. Compared with no impedance-matched SPP, the reflectivity of the SPP is improved by more than 20 dB.
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