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The analysis of the scattering properties of electrically large objects has always been a challenging problem. For highly accurate solutions to such problems the premier method is full-wave analysis with the MoM or MLFMM (as available in FEKO). For electrically huge structures, an asymptotic method such as PO is required. For very large problems, the full-wave methods result in prohibitive resource requirements, while PO may require an impractically large mesh for extremely large problems, and the PO run-time grows exponentially with multiple reflections.

To address these issues, FEKO's Ray Launching Geometrical Optics (RL-GO) method has recently been extended to allow plane wave excitations. RL-GO is a ray-based technique that models objects based on optical propagation, reflection and refraction theory. Ray-interactions with metallic and dielectric structures are modelled using Huygens sources placed at each ray-contact point on material boundaries. The ray-launching process is easily controlled, based on the angular spacing (for localised sources) or transverse spacing (for plane wave sources) of the rays and the number of multiple interactions allowed.