AN IMPROVED APPROXIMATE GAIN FORMULA FOR CONICAL HORN

摘要

The conical horn gain is expected to increase with increasing flare angle until it reaches a maximum and then should decrease. The available closed-form approximation for conical horn loss factor, and hence gain, is examined in this paper in this background. It turns out that this approximation is not consistent with the normal conical horn gain pattern for aperture phase deviation s > ～ 0.5. A new approximation is presented based on available data that results in "normal" gain pattern, and also improves the accuracy of the predicted gain values.