High-gain and low-profile metalens-horn antenna based on the fishnet metamaterial

Lenses are commonly used to reduce the profile and enhance radiation properties of horn antennas. To this purpose, metallic as well as metamaterial lenses have been successfully employed in the past showing a clear gain enhancement and shortening of the horn antenna (D. Ramaccia, et al., IEEE Trans. Antennas Propag., 61, 2929–2937, 2013). The aim of this work is to implement a high-frequency metamaterial lens-antenna based on a fishnet structure which promises improved impedance matching compared to dielectric lenses.