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ANTENNA LOBE SUPPRESSION. VOLUME 2. THE E-PLANE RADIATION PATTERN OF AN ANTENNA MODEL FOR HORN ANTENNAS
OHIO STATE UNIV RESEARCH FOUNDATION COLUMBUS
Diffraction theory is used in analyzing the radiation characteristics of typical horn antennas. The far-sidelobe radiation has been solved without employing equivalence principles which are impractical in the problem. A corner reflector with a magnetic line source located at the vertex is proposed as a model for the E-plane radiation of horn antennas. Diffraction theory is applied to formulate the radiation pattern of this antenna model. A complete pattern, including multiple interactions and images of induced line sources, is obtained in infinite series form. Diffraction mechanisms are used for appropriate approximations in the computations. Emphasis is made on the continuity of the radiation patterns. The computed patterns are in excellent agreement with measured patterns of typical horn antennas. Radiation intensity of the backlobe relative to main-lobe intensity is obtained as back-to-front ratio and plotted as a function of antenna dimensions. A set of measured back-to-front ratios is presented to demonstrate the validity of computation.
See also AD623074. DOI: 10.21236/AD0623073
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