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A new compact wideband circularly polarized (CP) antenna is proposed in this work. The antenna consists of a CP square-loop with sequential phase (SP) characteristics, four strip-lines as driven elements, four L-shaped patches with I-slots and four I-shaped patches as parasitic elements. The square-loop is utilized to feed the two pairs of parasitic patch arrays by a capacitively coupled way. The proposed antenna has a broad 3-dB axial ratio bandwidth (ARBW) of 18.9% (6.35 GHz, 5.75-6.95 GHz), and a wide 10-dB impedance bandwidth (IBW) of 23% (6.38 GHz, 5.65-7.12 GHz). Besides, the presented antenna features flat gain within the CP operation bandwidth and compact structure.