Wide-angle scanning millimeter wave array antenna

The invention discloses a wide-angle scanning millimeter wave array antenna. The wide-angle scanning millimeter wave array antenna comprises a radiating antenna array and a periodic metal coating structure, the radiating antenna array comprises at least one broadband resonant antenna unit, the periodic metal coating structure is arranged above the radiating antenna array and is an inclusion material consisting of dielectric layers with the same dielectric constant and periodically arranged metal patterns; and a certain distance is kept between the periodic metal coating structure and the radiating antenna array. The periodic metal coating structure is arranged above the radiation antenna array, and the height from the coating structure to the array antenna and the characteristics of the periodic metal material are adjusted, so that the radiation pattern of the antenna unit can be broadened to a great extent, and the beam scanning angle of the whole antenna array is increased; meanwhile, the isolation between