Designed is a novel broadband micro-strip antenna with the shape similar to Chinese character ‘回’. The proposed antenna structure mainly consists of two square rings, and four rectangle radiation patches are printed to connect them. The material of the substrate is glass fiber epoxy resin, with the thickness of 1.6mm and area of 30mm×45mm. Printed circuit board technology is adopted to form the antenna structure, and the reference ground is printed on the back of the substrate. Sweeping frequency from 1~8GHz, the designed antenna can cover the range of 2.1~4.3GHz by Ansoft HFSS 13.0 with the relative bandwidth of 68%. The simulation results of reflection coefficient, voltage standing wave ratio, input impedance and gain pattern are given, and also the influence of structural parameter on radiation performance is analyzed. The actual measurement results are basically consistent with the simulation results.