A numerical study on electrical characteristics of large deployable reflector antennas with phased array feed

In the electrical study of large deployable reflector antennas with phased array feeds, the relationship between the performance of feed equipment and the radiation characteristics has not been investigated. To achieve the op timum satellite antenna system, this paper describes the electrical charact eristics, which include a relationship between the antenna gain and beam di rection when a dynamic range of excitation amplitude is constrained and the reduction of antenna gain related to the malfunction of amplifiers. For ex ample, we could clarify that the beam scanning area, in the case of phase c ontrol only, is narrow as compared to amplitude and phase control, and also when the dynamic range of amplitude is constrained, the minimum reduction of antenna gain within -0.3 dB can be achieved.