A serrated edge Gregorian subreflector for dual chamber compact range systems

The performance of a Gregorian subreflector compact range system is studied. The compact range system uses a cosine blended rolled edge main reflector. Thus, the main reflector edge diffraction in the potential target zone of the compact system is very small. However, it was found that the diffraction from the edges of the subreflector degrades the incident fields on the main reflector, which subsequently leads to undesired stray fields in the target zone. To reduce the subreflector edge diffraction incident on the main reflector, serrations were added to the subreflector. It is shown that by using the serrated edge reflector, one can reduce the subreflector edge diffraction incident on the main reflector, which subsequently lowers the undesired stray fields in the target zone