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Aperture coupled phased array antenna design at Ku band is introduced. The array spans entire Receive Band of Ku band (10.8 GHz - 12.75 GHz) and has a gain greater than 24.5 dBi with approximately 330×70×25 mm (LxWxH) dimensions. Low loss waveguide-microstrip type hybrid feed network is also designed and simulation results are presented. Aperture efficiency greater than 70% is achieved.