Abstract
Reflective metasurfaces have been widely explored for generating orbital angular momentum (OAM) carried by vortex beams. However, the most OAM generators have narrow bandwidth or major for circular polarization waves, which are caused by the propagation phase and Pancharatnam–Berry (PB) phase. In this letter, by combining the propagation phase and reflection polarization conversion metasurface, a novel OAM generator operating at microwave band is proposed, which is based on a low <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$Q$</tex-math> </inline-formula> -factor C-shaped element. A proof-of-concept prototype is fabricated and measured. This generator not only covers a broad bandwidth from 12 to 18 GHz (40%) but can also be used for dual-linear and dual-circular polarized waves.
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