Showing papers by "Per-Simon Kildal published in 1986"

An asymptotic transition region theory for calculation of diffraction losses in multiple reflector antennas

Abstract: JntrOdUCtiOQ: The paper presents an asymptotic transition region theory of diffraction (TRT), which can be used to predict and minimize losses due to diffraction from the feed system in a reflector antenna, if the feed system is a line feed, or a point source plus one or more subreflectors. The theory is a simplification and specialization of the uniform geometrical theory of diffraction (UGTD) and of well-known asymptotic radiation integral solutions as well as an extension of these teories to include asymptotic secondary results like efficiency losses and diffraction spillover. Compared with numerical integration, these results are much faster. provide considera* more insight into the diffraction process, and are better adapted to the design stage. The complete theory will be presented in C 1 3 . and is an extension and generalization of that presented in C23 and applied in C33.