Dual-frequency circularly polarized spiral antenna for satellite navigation
US4008479A · kind A · utility
74Cited by
1References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 3, 1975 |
| Grant date | Feb 15, 1977 |
| Priority date | — |
| Expiry date | Nov 3, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q5/357
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
This disclosure deals with a novel dual-frequency circularly polarized antenna that is particularly adapted for receiving satellite transmissions and/or for transmitting signals to satellites as for navigation purposes, the antenna being adapted through novel conductive preferably spiral-element configurations of different lengths, to produce substantially omnidirectional horizontal coverage and substantially hemispherical vertical coverage at two or more operating frequencies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.