A waveguide horn is described which improves the efficiency of H-plane stacked horn array for reflector feeds. It makes use of dielectric loading for sharpening the H-plane pattern and trifurcation to reduce the large E-plane sidelobes. As a result, there is less energy loss in the spill over and more energy available for the secondary beam. Expressions for the horn radiation patterns are given. The computed patterns show good agreement with those measured.
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Chan et al. (1980) studied this question.