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A quad-band reflectarray antenna that operates at both Ku (12.5 and 14.25 GHz) and Ka (20.4 and 30.2 GHz) bands is designed for satellite communications. The multi-layer configuration is adopted with the frequency selective surface (FSS) backed Ka-band elements above the Ku-band elements. An FSS with triple ring slots is optimized to achieve transmission at Ku band and reflection at Ka band simultaneously...
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