Analysis of offset reflector performance fed by 2×2 microstrip antenna array using GO technique

This paper investigates an offset reflector antenna system performance for a 2×2 microstrip planar array feed. Here, the cross-polar and sidelobe levels for an offset reflector antenna operating in the Ka-band frequency of 20 GHz are evaluated for variation in separation between array elements placed at the focal plane of the parabolic reflector. The antenna array is designed to illuminate an offset reflector antenna having a diameter D = 50λ and F/D ratio 0.6, Fis focal length. The simulation studies have been carried out using HFSS 15.0 to verify the analytical results obtained using GO.