The results show that lumped impedance loading can reduce RCS at resonant frequencies, while cutting slots in patch properly can reduce RCS in a relatively wider frequency band, but radiation property of the antenna changes little. 6. 结果表明,集总阻抗加载能降低谐振频率点的RCS,优化后的开槽加载能在辐射特性改变不大的情况下,在较宽的频带内减缩微带天线的RCS。