Metamaterial-Based Flat Lens for Beam Shaping

This paper introduces a metamaterial-based flat lens working in the microwave field. The lens can convert a Gaussian incident beam into a flat-top beam to mimic the function of a beam shaper. Unlike traditional dielectric beam shapers, the refractive index of metamaterial lenses can vary radially, so the lens profile is flat, and the thick-ness of the lens is thin. The metamaterial cell comprises a square metal patch and a dielectric substrate. Finally, the simulation results verify the feasibility of the theory.