Millimeter wave antenna array element, antenna array and communication device

The invention discloses a millimeter wave antenna array element which comprises two vertical platy radiation units. The platy radiation units are mutually orthogonal and used for radiating vertical polarization direction signals and horizontal polarization direction signals. The platy radiation units comprise lower substrate integrated waveguide (called SIW for short) filters and upper gradient fin line antennas, and the lower substrate integrated waveguide filters and the upper gradient fin line antennas share the same dielectric substrate. The invention further discloses a millimeter wave antenna array and a millimeter wave communication device. Radiation components and the filters are vertically integrated into a whole, the millimeter wave antenna array element has the advantage of compact structure, and more importantly, phases and amplitudes of signals transmitted by each array element in the antenna array can be kept basically the same. 本发明公开了种毫米波天线阵元，包括两片竖直设置且相互之间正交的片状辐射单元，分别用于辐射垂直极化方向信号和水平极化方向信号；所述片状辐