Diffraction theory is used in analyzing the radiation characteristics of typical horn antennas. The far-side-lobe and back-lobe radiation has been solved without employing equivalence principles which are impractical n the problem.nA corner reflector with a magnetic line source located at the vertex is proposed as a model for the E-plane radiation of horn antennás. Dif-fraction 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 com¬puted patterns are in excellent agreement with measured patterns of typical horn antennas. Radiation intensity of the back-lobe 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.
展开▼
