Based on the traditional crossed dipole antenna, a wideband circular polarization antenna used in Global Positioning Systems(GPS) is designed. The crossed dipole is fed with a 50 Ω coaxial line. The crossed dipole can produce circularly polarized performance because of the orthogonal arms of dipoles with the phase difference of 90° due to a pair of vacant-quarter print rings. To achieve a broader impedance bandwidth and Axial Ratio(AR) bandwidth, the coupling patch is cut and slotted. Simulation results in Ansoft HFSS show that the antenna has an impedance bandwidth(|S11|<-10 dB) of 66.7% (1.141-2.283 GHz) and a 3 dB bandwidth of 33.3%(1.347-1.885 GHz). It has the maximum circular polarization gain of 8.2 dBi at the operating bandwidth. It has good circular polarization characteristics and the bandwidth can be expanded.