Title :
Paraboloidal reflectors with axial excitation
Author :
Donaldson, A.R. ; French, I.P. ; Midgley, D.
Author_Institution :
Associated Electrical Industries (Rugby) Ltd., Rugby, UK
fDate :
11/1/1960 12:00:00 AM
Abstract :
The reflectors are deep paraboloids having axially oriented dipoles at the foci. Odd-function aperture distributions and radiation patterns are derived by approximate methods and are compared with an experimental polar diagram. In spite of a null along the axis, strong coupling at short range is observed between two aligned aerials. This is associated with a coupling diagram of abnormal directivity, which may be explained by a principle of field-fitting between the incident field and the normal aperture distribution. A reduction of Maxwell´s equations in paraboloidal co-ordinates to Bessel´s equation is appended.
Keywords :
directive antennas;
Journal_Title :
Proceedings of the IEE - Part B: Electronic and Communication Engineering
DOI :
10.1049/pi-b-2.1960.0166