In this paper,a compact wide-stopband cavity filter covering the entire Ku-band(10.7 GHz-14.5 GHz)is designed,which is a"block-mode"filter.By opening some longitudinal grooves on the crease waveguide of the wrinkled waveguide filter,the higher order mode can be effectively suppressed.By optimizing the size of each metal rectangle of the"block mode"filter,it meets the 3-octave frequency of the filter and has a good out-of-band suppression effect.Compared with the tra-ditional metal iris cavity filter,the filter has a good wide pass band and a wide stop band with high attenuation,and can effectively suppress many high-order modes.The simulation results show that in the required 10.7 GHz-14.5 GHz band|S11|,all of which are better than-25dB,and the average rejection of the entire Ka-band is less than-75dB.The filter designed in this paper is compact and easy to process,and has a good application prospect in the engineering application of multi-feed system.
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