Citation
Abstract
The efiect of deformable-mirror position on main-reflector-distortion compensation is considered through a case study. The case of a dual-shaped reflector antenna and magnifying ellipse followed by a deformable mirror and feed is considered. The efiect of feed gain on the compensation is also studied. It is found that the optimum position for the deformable mirror in the beam path computed using physical optics is in excellent agreement with that predicted using simple optical models for the system and the lens law. The sensitivity of the available compensation is a function of the magnitude of the main-reflector distortion, with the location of the deformable mirror becoming more critical for larger main-reflector distortions. Increases in feed gain on the order of 3 dB from the optimum are found to have only a small impact on the efiectiveness of the compensation.
Keywords
Details
- Volume
- 42-145
- Published
- May 15, 2001
- Pages
- 1–13
- File Size
- 388.0 KB