Design of W band rectangular waveguide filter

To study the relationship between the performance and the size of the filter, a W band rectangular waveguide bandpass filter was designed. First, a four cavity bandpass filter was designed, and then improved its structure to generate a transmission zero on both sides of the passband. The cross coupling structure reduces the rectangular coefficient by 25.7% and enhances out of band rejection. The simulation results of the three kinds of center frequency models show that the scale effect between the center frequency and the structure size. The parameters of the filter were analyzed by HFSS software. The results show that the center 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 90GHz center frequency model was processed and tested, and the test results were mainly agreement with the simulated results, which provides a reference for the design and simulation of the rectangular waveguide filter.