The analysis method adapted in this paper is the conservation of complex power technique combining even and odd mode analysis method, more accurate results have been obtained when correction to the errors due to electrical wall condition in the section of the metal septum is introduced. 在分析方法上,本文采用复功率守恒技术和奇偶模分析法,并考虑到膜片端面电壁条件的修正,因而比一般的模匹配法有较高的精度。