MSAT mast antenna with reduced frequency scanning
US5485170A · kind A · utility
34Cited by
24References
32Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 10, 1993 |
| Grant date | Jan 16, 1996 |
| Priority date | — |
| Expiry date | May 10, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49016
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A mobile vehicular antenna for use in accessing stationary geosynchronous and/or geostable satellites. A multi-turn quadrifilar helix antenna is fed in phase rotation at its base and is provided with a pitch and/or diameter adjustment for the helix elements, causing beam scanning in the elevation plane while remaining relatively omni-directional in azimuth. The antenna diameter and helical pitch are optimized to reduce the frequency scanning effect. A technique is provided for aiming the antenna to compensate for any remaining frequency scanning effect.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.