A Reflective Metasurface to Generate Vortex Beam Carrying Orbital Angular Momentum for C-band Applications

Abstract

In this letter, a novel unit cell is proposed which can be used as a phase controller of the electromagnetic wave at a specific frequency or a range of frequencies. The presented unit cell is designed at 6GHz with two stubs whose length changes from 1 mm to 9 mm parallel to the diameter of a square ring. For the design of the reflectarray antenna providing a vortex beam at the desired frequency the calculations of aperture efficiency have been performed and analyzed. By using full-wave simulation two reflectarrays producing orbital angular momentum with modes 1 and 2 have been implemented and verified. The simulation results demonstrate the good performance of the presented reflective antenna to generate an OAM (orbital angular momentum) beam.