L.I. Ponomarev, V.A. Vechtomov, A.S. Miloserdov

In the article a multiple beam PAA (MBPAA) consisted of multiple beam large-aperture radiators (LAR) design possibility is considered. The radiators are made as a reflector antenna with multielement feed consisted of circle waveguides system. An LAR parameters optimization has been carried out (reflector radius, focal length, waveguide radius and waveguide number in the feed) for the purpose of LAR gain relief forming in tapered scan sector with apex angle of 8.7º corresponding Earth view angle from a geostationary satellite. It-s determined, optimal number of circular waveguides in a feed is 7, optimal reflector radius is from 5.125λ to 6.029λ, focal length is from 3.183λ to 4.485λ. For such structure the LAR parameters modeling carried out by FEKO has let determine the LAR relief in scan sector is from 0.616 to 0.71. Individual feed elements excitation law has been determined, which gives required gain relief. Minimal LAR number relation on required MBPAA gain and minimal MBPAA beams number in considered scan sector has been determined, which guarantees required gain. Possible MBPAA of LAR design schemes are considered.