Cassegrain aerial system
US4673947A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 20, 1986 |
| Grant date | Jun 16, 1987 |
| Priority date | — |
| Expiry date | Feb 20, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q19/193
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A high bandwidth microwave antenna feed comprises a spigot (4) of relatively high dielectric constant protruding from a conventional hollow waveguide (3) and a generally conical member (12) of relatively low dielectric constant fitted coaxially onto, so as to expand from the protruding spigot. The base portion (2) of the conical member is silvered and constitutes a sub-reflector. In use, microwave radiation from the hollow waveguide is refracted at the spigot/conical member interface and is reflected from the sub-reflector to a facing main reflector (1). The two-part dielectric construction enables the dimensions of the sub-reflector to be reduced, thereby reducing blockage of the main reflector and increasing the bandwidth of the system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.