本文设计了一款基于基片集成波导的小型化双工器。双工器由两个带通滤波器并联构成,公共部分采用微带T型枝节。和传统的利用半模、四分之一模矩形谐振器设计滤波器相比,本文中通过在三分之一模三角形谐振器上加载缺陷地结构的方法能够使得滤波器的尺寸更小。为了验证双工器设计的有效性,对该设计模型进行了实物加工,实测结果能够和设计值保持较好地吻合。 This article designed a miniaturized duplexer based on a substrate integrated waveguide. Duplexer consists of two band-pass filters in parallel, the public part of the microstrip T-type branches. Compared with the traditional design of filters using half-mode and quarter-mode rectangular resonators, the size of the filter can be reduced in this paper by loading the defective structure on the one-third-mode triangular resonator. In order to verify the effectiveness of the design of duplexer, the design model was processed in-kind, the measured results can be well consistent with the design value.