Secondary reflector for SHF antennae of the Cassegrain type
US6809695B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 2, 2004 |
| Grant date | Oct 26, 2004 |
| Priority date | — |
| Expiry date | Feb 2, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q19/19
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The invention concerns the secondary reflectors of SHF antennae of the Cassegrain type.It consists of providing the secondary basic reflector (103) of this antenna with a first circular ring (104) in the shape of a cylinder directed toward the main reflector, and a second ring (105) in the shape of a circular crown fixed to the end of the cylinder, and projecting outward from the latter. These rings are made from a conducting material. The length of the cylinder and the width of the crown are of the range of one quarter of the average wavelength for which the antenna is dimensioned.This enables the “overspill radiation” of the secondary reflector to be reduced considerably, and therefore allows the dimensions of the antenna to be reduced significantly for equivalent performance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.