一种新型X波段基片集成波导双模带通滤波器

提出一种具有对称传输零点的基片集成波导双模带通滤波器．该滤波器含有两个双模矩形基片谐振腔，通过在谐振腔中引入电感不连续性，可以产生简并模式的耦合;每个谐振腔中不同模式间的相位差在通带两边各引入了一个传输零点，极大地改善了阻带特性．采用该方法设计了一个新型X波段双模带通滤波器，仿真与测试结果吻合．

Novel X-band dual-mode bandpass filter based on the substrate integrated waveguide

This paper presents a novel dual-mode filter with symmetric transmission zeros based on the substrate integrated waveguide(SIW). This filter contains two dual-mode SIW rectangular cavities. By making use of the inductive discontinuities in an SIW cavity, two coupling degenerate modes can be excited. Due to the phase difference between the two modes in each cavity, two transmission zeros on each side of the passband are created, so the out-of-band rejection of the filter is significantly increased. An SIW dual-mode filter with a center frequency of 12GHz has been fabricated and measured using the proposed method. Experimental results agree well with the simulation results.