In this paper, Broadband circularly polarized antenna using Artificial Ground Structure is presented. Bandwidth of this anntena gets wider when the substrate is extended in the Y-axis. This antenna is simulated by hfss10.1 Simulated results are 56.30% (4.48 - 7.99 GHz) in S11 bandwidth and 30.12% (5.47 - 7.41 GHz) of Axial Ratio bandwidth.
