Optimized Design of Axially Symmetric Cassegrain Reflector antenna using Iterative Local Search Algorithm

Abstract

Dual reflector antennas are considered as pencil beam antennas that can produce radiation identical to searchlight beams. As compared with front-fed configuration, design of dual-reflector geometry is complicated since the parameters like feed location, sub reflectorsize, required taper on sub reflector, selection of focal length to diameter ratio of the main reflector, amplitude distribution provided by feed etc. are to be adjusted as per the given specifications. Also the side lobe suppression effort requires the antenna to be designed for minimum sub reflector blockage. The design of such a cassegrain reflector is considered for the minimum blockage condition. Along with the parameters like high gain and low cross-polarization; low VSWR is also one of the prenominal parameter that can be achieved. The optimized values of f/Dand angle subtended by the sub reflector is obtained by using Iterative Local Search algorithm. For obtaining the radiation diagrams, ‘Induced Current Analysis of Reflector Antenna’ and GRASP soft wares are used. This will help us to identify the factors that affect the radiation pattern of the antenna.