Dual-mode waveguide band-pass filter

The invention discloses a dual-mode waveguide band-pass filter, which comprises two waveguide tubes which are arranged in parallel. One end of each waveguide tube is provided with a port flange plate,and the other end of each waveguide tube is provided with a bottom cover plate; coupling metal boxes of hollow structures are arranged in the middles of the adjacent sides of the two waveguide tubes.A coupling window partition plate is arranged in each waveguide tube; the coupling window partition plate is fixed on the inner wall of the first waveguide tube and form a coupling window with the inner wall of the first waveguide tube; a mode excitation metal block is arranged at the bottom of the center of the rectangular resonant cavity; the cross section of the mode excitation metal block inthe horizontal direction is square, and an isosceles triangle chamfer is arranged at one corner of the mode excitation metal block; and the two waveguide tubes are arranged in a mirror symmetry mode.The defects that an existing