Offset fed reflector
The reflector can be analyzed using the student version of GRASP9 available from TICRA (www.ticra.com) using a Gaussian beam feed antenna.  A step-by-step presentation can be downloaded: single_offset_ppt_audio with an audio track or using GRASP10 single_offset10_audio_ppt along with a set of GRASP files: single_offset_GRASP.
single_offset_refl.gif