提取feko的ffe文件的散射场，适合电磁雷达专业学生(Extract feko ffe file scattering field, suitable for electromagnetic radar professional students)

fortran读取feko跑的目标的散射场，电磁仿真的研究可以借鉴下(FORTRAN reads the scattered field of the target of FEKO running, and the research of electromagnetic simulation can be used for reference)