Horn Feeding a Large Reflector

Calculate the gain for a cylindrical horn feeding a parabolic reflector at 12.5 GHz. The reflector is electrically large (diameter of 36 wavelengths) and well separated from the horn. Several techniques available in Feko are considered to reduce the required resources for electrically large models.

Use the following techniques to reduce the required resources:
  • For electrically large models, use the multilevel fast multipole method (MLFMM) instead of the method of moments (MoM). The required memory is reduced considerably by using MLFMM.
  • For subparts of the model, use large element physical optics (LE-PO).
  • Subdivide the problem and use an equivalent source.
    • Near field source - A region can be replaced by equivalent electric and magnetic field sources on the boundary of the region.
    • Spherical modes source - A far field can also be used as an impressed source.

Figure 1. A 3D view of the cylindrical horn and parabolic reflector with symmetry in CADFEKO.
Tip: It is recommended to create the models in the order it is presented as each model uses its predecessor as a starting point. If you would like to keep the different models, save each model to a new location before starting a new sub example.