Abstract: This paper puts forward and implements a brand new type of full aperture, higher isolation, dual polarization,monopulse tracking array antenna. The unit of this array antenna is composited by microstrip patch and horn model. The microstrippatch is taken as the exciting source of the horn and can get higher gain. The microstrip patch adopts a pair of vertical stripline whichutilizing two H-Type slot-coupling distributed as T-Type, consequently can get higher polarized-isolation (within workfrequency-band lessing than -35dB). Using secondary phase reversal technology in the design of array feed, can further improve thepolarized isolation and cross polarization. The result of simulation and measurement indicates that, within f0±200MHz, VSWR is less than 2, the gain of vertical polarization is more than 27dB, the gain of horizontal polarization is more than 27.5dB, polarizedisolation of the ports is less than -40dB, the isolation of sum-difference ports is less than -28dB.