Broadband opening ridge waveguide phased array antenna unit

The invention provides a broadband opening ridge waveguide phased array antenna unit, which comprises a rectangular waveguide wall, a transition ridge, a waveguide ridge and a floor. An opening rectangular waveguide is internally ridged, thereby reducing cut-off frequency of the waveguide and reducing section size of the opening waveguide, and furthermore, reducing space between antenna units and ensuring wide-angle scanning of the antenna within a wider frequency range without grating lobes; the opening rectangular waveguide extends out of the floor to a certain height, thereby optimizing opening waveguide and antenna floor structure, reducing mutual coupling between the antenna units and ensuring good port impedance matching of the antenna when carrying out wideband wide-angle scanning, and ensuring no scanning blind points; and the transition ridge is equivalent to impedance conversion between air resistance and feed ridge waveguide impedance, so that an antenna feed port can be matched within a wider freq