A Flush-Mounted Runway Antenna for Use with the FAA Directional Glide-Path System

A flush-mounted airport runway antenna has been designed, built, and tested which will allow glide-path signals for instrument landings to be radiated directly from the touchdown point on the runway. Empirical and simplified analytical design procedures are discussed together with a comparison of desirable and measured antenna characteristics. Sufficient low-elevation angle directivity has been obtained from a prototype antenna to provide a path which extends well beyond 5 miles, the approximate distance at which the glide is intercepted in practice.