Abstract
In this paper, a wide band, polarization-insensitive reflectarray composed of 14 × 14 unit elements is proposed to generate vortex beams of different orbital angular momentum (OAM) modes with higher mode purity. The multiple resonance architecture of the unit element is designed and achieved 750°of the reflection phase by varying geometrical dimensions, which contributes to the remarkable increase in linear phase bandwidth. The unit element provides stable responses for different incident angles of electromagnetic wave. The prototype of proposed reflectarray with the size of 350 mm × 350 mm is designed, fabricated using printed board technology, and experimentally tested. The measured results confirms that a OAM vortex beam l = +1 is successfully generated at 5.75 GHz with a high gain of 21.3 dBi and a low divergence angle of 12°.
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