Abstract: In order to meet the application requirements of polarization adjustment and smart jamming for wideband high-power phased array, it is necessary to study the ±45° dual-linearly-polarized array antenna. The main body of the array element is composed of metal cross dipoles, and the working bandwidth is further extended by introducing the metal parasitic layer and the wideangle matching layer, and the large-angle scanning characteristic is improved too. A pair of coaxial feeders and two pairs of baluns are used to realize the balanced feeding and impedance transformation, and the metal reflective cavity is used to adjust the boundary conditions between adjacent elements after arraying, so as to optimize the mutual coupling characteristics between the array elements. Experiment and simulation results show that the array antenna has good radiation characteristics in the working frequency band of 0. 96 GHz~2 GHz, and can achieve two-dimensional ± 30° beam scanning range. In addition, the array antenna has the characteristics of simple structure, easy-installation and high-power capacity, which is suitable for the application of high-power wideband interference phased array system.