The convergent properties of the multimode method are discussed . finally a diplexer employing h - plane t - junction and preassigned e - plane metal - insert branching filters is given . and the scattering parameters of the un - optimized diplexer were obtained by the computer program 在論文的最后部分設(shè)計了兩個e面金屬插片濾波器,并把它們作為通道濾波器和h面t形結(jié)組成雙工器,用矩形波導(dǎo)雙工器的分析程序?qū)λM(jìn)行了分析,給出了分析結(jié)果。