Instrument landing glide slope
US6344822B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 20, 1999 |
| Grant date | Feb 5, 2002 |
| Priority date | — |
| Expiry date | Jan 20, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q13/12
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
This invention provides an improvement in Glide Slope antenna systems of the earth-image type. The standard antenna usually is mounted on a steel tower located several hundred feet to one side of the runway, considered a safe distance to avoid being struck by an airplane. This invention, however, employs an antenna system using wide aperture slotted cable elements. Frangible construction permits it to be located safely much closer to the runway. The closer spacing, with the wide aperture, provides for a vertical guidance pattern that is narrower in azimuth, resulting in improved quality of guidance. An additional slotted cable, fed only with clearance signal, provides fly-up indication, both sides, over a wider azimuth sector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.