In order to solve the problem of narrow band width of low profile microstrip antenna, a two-layer patch slotted microstrip antenna with a height of only 0.11 λ0 is designed. By feeding two patches simultaneously, the bandwidth of the microstrip antenna is widened, and the standing wave bandwidth reaches 17.9%. The simulation results of HFSS design show that the antenna unit has good impedance matching characteristics, the standing wave bandwidth is 17.9%, and the gain is 5.89 dB, which meets the standard of broadband antenna. The antenna unit is composed of 6×6 array. Through simulation analysis, it is found that the antenna has VSWR≤2 in the band range of 31.0 GHz~36.5 GHz, the relative bandwidth is 16.4%, the gain is 20.28 dB, and the antenna has good radiation characteristics in the scanning range of -60°~60°. The antenna has the advantages of miniaturization, easy integration and simple manufacture. It can be used in a variety of communication systems and has a good application prospect.