请教关于透镜天线的仿真问题

为了降低复杂度，如果将初级馈源天线仿真结果作为激励，得出的方向图，是不是只是透镜的方向图，而不是初级馈源和透镜整体的方向图。如果是这样的，怎样才能将初级馈源和透镜的方向图进行叠加。
如果将初级馈源的实际结构加进去一起仿真。如何对初级馈源结构用MLFMM，而透镜用PO仿真，具体怎么设置?
谢谢！

如果将初级馈源的实际结构加进去一起仿真。如何对初级馈源结构用MLFMM，而透镜用PO仿真，具体怎么设置?
初级馈源结构 EX.25
透镜... GO.. 记忆体数量够多 FEM.. EX17
25 Horn feeding a large reflector
Keywords: Waveguide, horn, reflector, PO, aperture source, spherical mode
source, equivalent source, decouple, far field
A cylindrical horn is excited with a waveguide port is used to feed a parabolic reflector at 12.5 GHz. The reflector is electrically large (diameter of 36 wavelengths) and well separated from the horn. An illustration of the model is shown in figure 25-1. This example illustrates some of the techniques available in FEKO to reduce the required resources for electrically large models.
17 Analysing a lens antenna using the Geometrical optics (GO) - ray launching
Keywords: Geometrical optics, lens antenna, dielectric, radiation pattern, radiation pattern point source
A dielectric lens with a spherical surface (S1) and elliptical surface (S2) is constructed.
The lens is illuminated by a radiation pattern point source based on a pre-computed horn antenna radiation pattern and the far field pattern is computed.
The lens structure is modelled using the Geometrical Optics (ray launching) method. The results are compared to the MoM/FEM result. The model is shown in Figure 17-1.
The notes below do not provide a step by step approach to re-construct the model,but are mainly intended to aid in an understanding of the ideas used during the model construction. It is suggested that the model provided with this example be opened and viewed while working through this text.

FEKO 中的多种算法混合，直线MoM与Po混合，或者MoM 与GO 混合，MLFMM与PO 不能混合。建议
1. 内存允许的情况下，直接全模型采用MLFMM
2..馈源用MoM ，反射面用GO （金属非金属都可以），计算精度也高
3..用等效源，这样馈源与透镜耦合就没考虑了

谢谢楼上两位，基本搞定了。就是仿出来的透镜聚焦性能太差

等效馈源效果不太好，但可以看出馈源位置对方向图的大概影响；馈源用MOM，介质体用几何光学就可以了；透镜面尽量光滑，时间快一点。