Low backlobe variable pitch quadrifilar helix antenna system for mobile satellite applications
US6545649B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 31, 2001 |
| Grant date | Apr 8, 2003 |
| Priority date | — |
| Expiry date | Oct 31, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q11/08
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A quadrifilar helix antenna system that is wound with a helical structure that changes pitch towards top of the antenna. An exemplary antenna system has first and second bifilar helical loops that each comprise a pair of orthogonal windings disposed around a common central axis. Each loop has a winding pitch that varies along the axis to achieve backlobe radiation suppression from the antenna system. First and second terminals are coupled to respective top ends of the bifilar helical loops. The terminals may be fed in phase quadrature by a quadrature hybrid. The antenna system may also include short circuit coupled to respective bottom ends the first and second bifilar helical loops. The antenna system is preferably used in vehicle-to-satellite mobile communication applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.