Abstract: Based on the conventional construction of microstrip slot antenna, a new wide band rectangle microstrip slot antenna is designed, which is fed by coplanar waveguide (CPW) with fork-like microstrip lines. The impedance of CPW line is 100 Ω. The antenna is matched better through adjusting the dimensions of chief-arm and side-arms and the width of slot lines in feeding net. The results of simulation and test show that 67.60% bandwidth (VSWR<2) can be obtained at the center frequency of 7.00 GHz.