W-band ultra-wideband waveguide filter

The invention belongs to the technical field of microwaves, and particularly relates to a W-band ultra-wideband waveguide filter which structurally comprises a resonant cavity and a metal loading capacitor, and the front end of the cavity is provided with a downlink filter port and an uplink filter port; the resonance unit is composed of nine resonance cavities, and every two adjacent resonance cavities are connected in a direct coupling mode. A metal column is inserted into the H surface of each resonant cavity by using a capacitance loading technology, so that ultra wide band, high out-of-band rejection and miniaturization are realized; the structure is formed by offset coupling of nine rectangular resonant cavities, circular metal is inserted into the resonant cavities, and the whole structure is symmetrical about the fifth resonant cavity; according to the structure, the number of parameters is small during simulation optimization, the design time is shortened, and the design efficiency is improved. 本发明属于