fdtd计算天线等目标的电磁散射特性，需使用mingw编译/ 可计算s11，s21等参数。 程序较复杂 需耐心看-the fdtd calculate the antenna and target electromagnetic scattering characteristics, use the mingw compiler/computable s11, s21, and other parameters. More complex procedures need to be patien

FDTD中利用监视器电场提取S11，S21，S12，S22参数(In FDTD, S11, S21, S12, S22 parameters are extracted from the monitor electric field.)