Broadband high-gain circularly polarized array antenna

The invention discloses a broadband high-gain circularly polarized array antenna. An antenna unit comprises a metal ground, a first dielectric plate, a second dielectric plate and a third dielectric plate, wherein the first dielectric plate, the second dielectric plate and the third dielectric plate are sequentially stacked on the metal ground; a 4 * 4 rectangular patch unit is arranged on the upper surface of the third dielectric plate; the upper surface of the second dielectric plate is also provided with a 4 * 4 rectangular patch unit; the upper surface of the first dielectric plate is provided with a feed longitudinal seam, and the first dielectric plate is also internally provided with an SIW feed structure composed of metal columns. According to the antenna, the double-layer metasurface structure which is tightly arranged is applied, so that the axial ratio bandwidth can be increased, and the antenna gain is improved. 本发明公开了一种宽带高增益圆极化阵列天线，所述天线单元包括：金属地，以及在金属地上依次层叠设置的第一介质板、第二介质板、第三介质板；第三介质板上表面设置有4×4矩形贴片单元