Abstract:Based on the working principle of Artificial Magnetic Conductor(AMC), a low Radar Cross Section(RCS) microstrip antenna with operating frequency in X-band is designed. Firstly, an AMC cell is designed, and the reflected phase difference of 180°±37° is obtained by the vertical incidence of X and Y polarized waves in the 8.6~14.6 GHz band range. Then, the AMC chessboard structure reflector is composed of 3×3 elements. The simulation results show that the reflector has smaller backward RCS than the Perfect Electric Conductor(PEC) plate with the same size. Finally, the AMC structure is arranged in coplanar with the microstrip antenna at 10 GHz, which maintains the good radiation performance and profile height of the original antenna, and achieves the RCS reduction of not less than 7.5 dB for the vertical incidence of two polarized waves in the frequency range of 8.4~14.8 GHz.