Launcher reflectors for correcting for astigmatism in off-axis fed reflector antennas
US4145695A · kind A · utility
25Cited by
9References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 1, 1977 |
| Grant date | Mar 20, 1979 |
| Priority date | — |
| Expiry date | Mar 1, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q25/007
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The present invention relates to novel launcher reflectors which are used with reflector antenna systems to compensate for the dominant aberration of astigmatism which was found to be introduced in the signals being radiated and/or received at the off-axis positions. A major portion of such phase error is corrected by using, with each off-axis feedhorn, an astigmatic launcher reflector having a curvature and orientation of its two orthogonal principal planes of curvature which are chosen in accordance with specific relationships, the launcher reflector being fed by a symmetrical feedhorn.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.