On the Theory of the Radiation Patterns of Electromagnetic Horns of Moderate Flare Angles

A method attributed to Schelkunoff for the computation of radiation patterns is considered. For the case of transverse electric waves in a waveguide or horn of moderate flare angle, the problem of calculating the radiation pattern is reduced to that of evaluating two definite integrals. These integrals are evaluated for rectangular, circular, and semicircular horns for some common modes of vibration. A small amount of experimental data are presented to illustrate the agreement between theory and experiment.