A novel broadband microstrip antenna is presented. Its shape is similar to Chinese character ‘回’. The proposed antenna structure mainly consists of two square rings. Between the square rings, four rectangle radiation patchs are printed to connect them. The material of the substrate is glass fiber epoxy resin. The thickness of the substrate is 1.6mm and area is 30mm′45mm. Printed circuit board technology is adopted to form the antenna structure and reference ground is printed on the back of the substrate. Sweeping frequency from 1GHz to 8GHz, it can cover 2.1GHz~4.3GHz by Ansoft HFSS 13.0. Relative bandwidth is 68%. The simulation results of reflection coefficient S11, voltage standing wave ratio VSWR, input impedance and gain pattern are given in this paper as well as the influence of structural parameter on radiation performance has been analyzed. Compared with the simulation results, the actual measurement results are basically consistent. The designed antenna can be used in wireless local area network, bluetooth, ZigBee, WiMAX (3.4 ~3.69 GHz), etc. It has a certain reference value.