Abstract: This paper proposes a new method for reducing radar cross section based on the analysis of the induced currents on the surface of the antenna. On the basis of the reference antenna, a novel microstrip antenna with reduced RCS is designed by using a new type of structure on the edges of the antenna. The proposed antenna can not only keep the radiation characteristics, but also reduces the RCS significantly from 4GHz to 12GHz compared to the reference antenna, when the angle of the incident wave and plane is quite small(grazing incidence). The average RCS decrement is 8.1dB in the angle range from -45°to 45°. Experimental results demonstrate the validity of this new method.