A new type of feed horn for low noise paraboloid antennas

Problems related to large Radio telescopes can be divided intotwo categories: those connected with the reflector structure andthose related to the feed horn design.The efficiency of a paraboloidal reflector antenna can bedetermined by the radiation patterns of its feed horn.At present, a great deal of effort has been spent on the searchfor highly efficient feed horns. In this connection, coaxial feedhorn and corrugated horns represent the most important development.This project, is concerned with the design and construction of acoaxial horn. Experiments were carried out to test and compare itsperformance with that of the corrugated counterpart which isavailable in the laboratory.Since the theory of mode-excitation and mode-control for thecoaxial horn has not yet well developed, the horn as an experimentalmodel was designed to give a demonstration of pattern synthesis,but not a large bandwidth