Localizer antenna system
US6346923B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 20, 1999 |
| Grant date | Feb 12, 2002 |
| Priority date | — |
| Expiry date | Jan 20, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q25/02
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
This invention relates to improvements in runway localizer antennas for the Instrument Landing System (ILS). The environment of modern airports has required that localizer antenna systems have larger apertures, with more elements, in order to produce the narrow beams needed to reduce multi-path interference. This, in turn, causes increases in the cost and complexity of the DU and associated coaxial feed cables. This invention uses features of a slotted cable antenna to replace a central distribution unit with a low-loss rigid copper transmission line running the entire length of the array. The radiating elements are fed from short cables through adjustable capacitors connected periodically along the rigid line.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.