The Flat-Topped Pattern Synthesis of the Multi-Feed Reflector Antenna

Numerous researches have been performed on the reflector antenna for realizing beam-shapingusing level-shaping. However, little study has been done for realizing the shaped beam throughthe multi-feed approach. The main goal of this paper is to provide a synthesis procedure forrealizing the flat-topped pattern in reflector antennas using the multi-feed approach. In this way,based on the genetic algorithm (GA) and utilizing the physical optic (PO) method, the excitationcoefficient of the feeding array is synthesized to achieve the desired pattern. Furthermore, in thispaper, an efficient method for reducing the computational time of PO integrals is introduced. Inthis way, the 3D PO integrals are mapped to 2D integrals; which results in about 30%computational time reduction. The proposed procedure is employed to realize a flat-toppedpattern in the angular scope of -20o to +20o and the radiation characteristics are compared withthose presented through the shaped reflector method in the literature. Results show that themulti-feed approach obtains the desired beam more accurately.