In order to solve the problem of slow polarization changing of airborne radar, a dipole antenna array is designed, which can change the polarization between pulses.The antenna array uses orthogonal slice electric dipole array unit, vertical strips and reflection board, for realizing feed through coaxial coupling Balun.Then, a 4×4 rectangular-grid rectangular-boundary uniform plane orthogonal polarized antenna array is formed by using the improved elements, and fast polarization changing is realized by RF-MEMS switch.Then, HFSS software is used for parameter optimization and modeling simulation.The results show that, the antenna array has low standing-wave ratio, low sidelobe level, and high gain, which can be used as a reference design for the antenna of the orthogonal polarization phased array radar or as a subarray of the orthogonal polarization array antenna.