Array antenna and circular polarized antennas thereof

The invention discloses an array antenna. The array antenna comprises a plurality of circular polarized antennas arranged according to a certain rule. Each circular polarized antenna comprises a planar ground layer, a radiation unit parallel with the ground layer, and a signal transmission line installed on the ground layer, wherein the ground layer is provided with an installation hole, the signal transmission line comprises a center lead which passes through the installation hole in an electrically insulated manner and extends in a direction substantially vertical to the ground layer, and a grounding lead which is electrically connected with the ground layer, and a position, which faces the ground layer, of the radiation unit is provided with a feed point for the center lead to be coupled thereto. The plurality of circular polarized antennas on the array antenna share the same ground layer.