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Wideband Circularly Polarized Dual-Mode Vortex Beams Reflectarray Design Using Dual-Semi-Split-Loop Elements
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DOI：10.1109/LAWP.2019.2948567.png)
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摘要
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In this letter, a wideband circularly polarized reflectarray composed of 3030 unit cells is proposed to generate dual-mode vortex beams. The element consists of two back-to-back semi-split-loop structures printed on the FR-4 substrate, an air layer, and a metal ground plane. The two back-to-back semi-split-loop structures provide the multiresonance property, which can effectively increase the bandwidth. A 360 phase range is achieved by changing the spatial orientations of the element. Based on the proposed element and the superposition design method of aperture field, a dual-mode square aperture vortex beams reflectarray is simulated, fabricated, and experimentally demonstrated. The measured results confirm that two vortex beams carrying 1 and -1 mode of orbital angular momentum are successfully generated in a wide range of frequencies from 5 to 8GHz. The size of the proposed reflectarray is 75cm75cm, and the measured maximum gain is 22.2dBic. The measured 1dB gain bandwidth is 33.3.
Keyword:
Reflector antennas
Wideband
Antenna arrays
Antenna measurements
Apertures
Frequency measurement
Orbital angular momentum (OAM)
reflectarray
vortex beams
wideband
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