The invention discloses a circularly polarized patch antenna. The antenna is designed on a dielectric substrate of any dielectric constant. One side of the dielectric substrate is a metal ground, andthe other side of the dielectric substrate is a fan-shaped radiation patch. A radius side of the radiation patch is connected to the metal ground through a short-circuit wall. The surface of the patchis connected to the metal ground through a short-circuit nail. Further, a rectangular groove is disposed on the surface of the radiation patch. The circularly polarized patch antenna can maintain aninherent low-profile property, has a good circular polarization characteristic and has a certain angle between the maximum radiation direction and the vertical plane of the antenna, that is, exhibitsa tilted circularly polarized beam radiation characteristic. The antenna uses coaxial feeding, has the advantages of simple structure, small volume, low profile and high bandwidth, and can achieve good oblique beam circular polarization performance.