Abstract
An empty horn antenna is filled with a bulk anisotropic metamaterial to enhance its gain and aperture efficiency. Radiation patterns in both the E-plane and the H-plane are improved owing to the anisotropic permittivity and the anisotropic permeability. Aperture efficiency over 70% is achieved despite of its short longitudinal length $\sim {\lambda _0}$ . Insertion loss below 0.18 dB and energy reflection below $ - 20~\hbox{dB}$ are obtained, which are quite small compared to most metamaterial-based antennas. The metamaterial-filled horn is fabricated and tested, and the measured results agree very well with the simulated results.
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