Radiation from a monopole excited cone

This paper considers radiation from a finite, right circular, perfectly conducting cone which is excited by a quarter-wave monopole protruding from the center of its base. The cone is assumed to be of a size which places it above the resonance region, making a solution by the geometrical theory of diffraction possible. A formula which allows determination of the tip radiated ray from a semi-infinite cone excited by a uniform, in-phase, magnetic ring current is first derived. This is then used in conjunction with certain other known canonical solutions to obtain a complete solution for the proposed excitation. Radiation patterns, computed on a digital machine from the formulas derived, are compared with measured results and good agreement demonstrated.