Abstract
The exact representation of the short back-fire antenna (SBA) which consists of the main reflector surrounded by a rim, and the subreflector is modelled using the surface integral equations. The numerical solution of these equations is used to calculate the far field radiation patterns, from which the directive gain is calculated by an integration of the radiation patterns. The optimum dimensions of SBA are obtained for two different types of the feed in structure a half wave dipole and a coaxial circular waveguide. The feed is located between the two reflectors. The geometrical dimensions are optimized to maximize the directive gain and the aperture efficiency. For the first excitation type a directive gain of 16.39 dB is obtained with an aperture efficiency of 91.17%. The second type is a new one and yields a directive gain of 18.035 dB with an aperture efficiency of 92.45%.
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