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This paper introduces a circularly polarized omni-directional antenna, which is composed of a monopole antenna and 6 patches of metamaterial polarizers. Each metamaterial polarizer includes three closely spaced metallic wires printed on a dielectric substrate. The metamaterial polarizer is used to transform the antenna radiation from linear polarization into circular polarization. Axial ratio (AR)...
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 . Insertion loss below 0.18 dB and energy reflection...
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