Wide-beam circularly polarized microstrip array element suitable for AOP millimeter wave phased array

The invention discloses a wide-beam circularly polarized microstrip array element suitable for an AOP millimeter wave phased array. The wide-beam circularly polarized microstrip array element comprises a radiation patch, a microstrip coupling line, a dielectric layer and a bottom floor, the radiation patch is located at the central position of the upper surface of the dielectric layer; the microstrip coupling line is located at the edge of the upper surface of the dielectric layer; the bottom floor is located on the lower surface of the dielectric layer, and the bottom floor is provided with a rectangular slot structure, a rectangular microstrip feeder line and a BGA ball mounting structure; the radiation patch is connected with the rectangular microstrip feeder line of the bottom floor through the metal via hole; and the microstrip coupling line is also connected with the lower surface of the bottom floor through the metal via hole. The ball mounting structure is directly interconnected with the radio freque