Design of a metasurface Luneburg lens antenna with flared structure

This article demonstrates the design of a meta-surface Luneburg lens antenna with flared structure. The lens antenna is composed of two flared metallic cones, a metasurface Luneburg lens and a reflection plate. The refraction index of Luneburg lens can be obtained by gradually changing the radius of patch arraying on the substrate. Such an antenna structure is easy to implement with low fabrication error. Some modified methods are applied to improve the radiation performance of this antenna. Simulation results show that the designed metasurface Luneburg lens antenna has a focused beam pattern with relatively low sidelobe level.