Airborne IFF antenna with switchable multiple patterns
US5231413A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 1, 1991 |
| Grant date | Jul 27, 1993 |
| Priority date | — |
| Expiry date | Aug 1, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q9/42
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An IFF airborne antenna including a single primary radiating element 20 with a plurality of nuisance elements 30, 40, 50 associated with the primary radiating element is disclosed in conjunction with a switching device for switching respective nuisance elements so as to selectively modify the characteristics pattern of the primary radiating element in order to obtain either an omnidirectional pattern corresponding to the pattern of the IFF surveillance mode or a first directional pattern corresponding to the fore directional pattern in the IFF interrogation mode or a second directional pattern corresponding to the monitoring pattern in the IFF interrogation mode. The switching of the nuisance elements makes it possible to selectively obtain the fore directional pattern corresponding either to a first IFF standard (Western standard) on a first frequency band or to a second IFF standard (Eastern standard) on a second frequency band which is different from the first frequency band.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.