Nearfield and site constraints on the design of high performance ILS-localizer antennas

Abstract

The currently increasing demand for all weather landing capabilities (CATIII) requires adapted high performance ILS-Localizer antennas. Antenna nearfield effects and given site circumstances set limitations on the use of very large aperture antennas because site reflections are caused actually by the effective nearfield amplitudes. Results of a realized high performance ILS-Loc-2F antenna are presented.