关键词: 雷达工程, 口径分布, 低旁瓣电平, 高口径利用效率

Abstract: A method of determining optimum aperture distributions of Cassegrain reflector antennas was presented. The necessity of seeking optimum aperture distribution of Cassegrain reflector antennas was illustrated by comparison of the sidelobe levels between Cassegrain reflector antennas and parabolic reflector antennas of the same aperture distributions as that of the former；optimum aperture distributions of Cassegrain reflector antennas is determined by means of simultaneous equations of constraint conditions of sidelobe level and aperture efficiency; other possible applications of the method of determining optimum aperture distributions of Cassegrain reflector antennas were enumerated. The investigated result demonstrates that compared with common aperture distribution，the optimum aperture distribution has better sidelobe level and aperture efficiency，i.e. the optimum aperture distribution has higher aperture efficiency at the same sidelobe level or lower sidelobe level at the same aperture efficiency.

Key words: radar engineering, aperture distribution, low sidelobe level, high aperture e