基于人工磁导体的低RCS微带天线设计

Design of low RCS microstrip antenna based on artificial conductor

摘要:

基于人工磁导体(AMC)的工作机理，设计了一款工作频率在X波段的低雷达散射截面(RCS)微带天线。设计了一种AMC单元，经X和Y极化波垂直入射在8.6~14.6 GHz的频带范围内，获得180°±37°的反射相位差；将其进行正交排列组成AMC棋盘结构的反射屏，反射屏中AMC阵列块由3×3的单元组成。仿真结果显示，该反射屏较相同尺寸的PEC板具有更小的后向RCS，将此AMC结构与工作频点为10 GHz的微带天线共面排布，在保持原有天线良好辐射性能和剖面高度的同时，在8.4~14.8 GHz的频率范围内对两种极化波垂直入射实现了不低于7.5 dB的RCS缩减量。

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.