W波段矩形波导滤波器的设计

Design of W band rectangular waveguide filter

为研究滤波器参数与其传输性能之间的关系,设计了一款含交叉耦合结构的W波段矩形波导带通滤波器。交叉耦合结构使滤波器的矩形系数减小25.7%,有效增强了带外抑制。不同中心频率的3款滤波器模型的仿真数据证明了滤波器腔体结构参数与其中心频率之间的比例效应。使用电磁仿真软件HFSS对滤波器的尺寸参数进行了扫描分析,结果显示,中心频率主要受腔体尺寸控制,耦合结构参数主要影响滤波器的损耗性能,耦合膜片厚度主要调节带宽。基于紫外光刻工艺对90 GHz滤波器模型进行了加工与测试,测试结果与仿真结果基本吻合。

To study the relationship between the performance and the size of the filter, a W band rectangular waveguide bandpass filter with cross-coupling structure is designed. The cress-coupling structure reduces the rectangular coefficient by 25.7% and en- hances out of band rejection. The simulation results of the three kinds of center frequency models show the scale effect between the center frequency and the structure size. The parameters of the fiher are analyzed by HFSS software. The results show that the cen- ter frequency is mainly controlled by the size of the cavity, the coupling structure mainly affects the loss of the filter and the thickness of the diaphragm can control the passband bandwidth. The 90 GHz filter model is processed and tested, and the test re- suits are mainly agreement with the simulated results.