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In this letter, we propose a low-profile planar reflector antenna based on metasurfaces. Metasurfaces are planar version of metamaterials, which are composed of 2-D arrays of subwavelength elements. Due to the subwavelength nature, metasurface-based reflector antenna can be made much thinner and grating lobes can be further suppressed. As an example, a 400 × 400-mm2 offset-fed planar reflector with...
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