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Abstract
ABSTRACT In this paper, a reflective metasurface with broadband and multiple orbital angular momentum (OAM) vortex beams is designed. The metasurface is composed of 24 × 24 modified I-shape units. By changing the opening angle β of the I-shaped unit, a high reflected amplitude of more than −0.9 dB and a reflected phase coverage of 360° can be achieved at 10–15 GHz. According to the superposition principle of phase, dual-beam, triple-beam, and quadruple-beam OAM metasurfaces can be designed. A dual-beam OAM metasurface prototype with +1 mode and −1 mode is fabricated and measured. The measured results show that the proposed metasurface can work at 10–15 GHz (40%), with a maximum gain of 20.0 dBi in the passband and the sidelobe level below −10 dB.
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