Circularly polarized antennas play an important role in communication through satellite navigation, radar, and information confrontation. In this letter, a miniaturized circularly polarized antenna operating in the GPS L1 band (1.575 GHz) is proposed. The proposed antenna possesses the advantages of having a low profile, small size, and compact structure, which in turn imply superior omnidirectional circular polarization. The radiation structure of the proposed antenna comprises a four-axis arched patch and a direct feeding metallic pin. Four inner additional arcs and four shorting pins were introduced for achieving the antenna miniaturization. The proposed design was verified by employing the Ansoft HFSS 16.1 simulation tool. The simulation results indicate that the proposed circularly polarized antenna matches well at the frequency of 1.575 GHz. Furthermore, the axial ratio is found to be less than 3 dB at the operating frequency band and the peak gain can reach a value of 0.2 dBic.