Radiation pattern evaluation with surface distortion error in large reflector antenna mounted on communication satellite for hybrid mobile communication system

摘要

In recent years, large satellite antenna has been developed for communications satellite. Especially, research anddevelopment of hybrid mobile communication system by using satellite and terrestrial is now proceeding. For thesesatellites, the reflector is deployable, stowed at lunch and deploy on orbit. Reflector may be constructed with multimoduleand deployable truss structure, and have a metal mesh surface.The reflectors of these antennas are very complex but radiation pattern of antenna will be affected by surfaceerror and distortion. With these large antennas, thermal distortion error especially can have serious implications,causing orbit beam direction errors, distortion of beam shape, and increasing sidelobe levels.This paper first describes the effect of reflector surface error for radiation pattern of reflector antenna, anddiscus the surface distortion analysis using Zernike polynomial, finally describe the experimental plan of radiationpattern measurement for deployable reflector antenna with phased array feed. The Zernike polynomial is used inoptics for the investigation of aberrations.