For a plane electromagnetic wave at nose-on incidence on a semi-infinite perfectly conducting cone expressions for the surface field components are obtained. These have been programmed for numerical computation and data are presented for the magnitudes and phases as functions of the distance from the tip for three different cone angles. Comparison with results derived from the physical optics approximation and from a simple wedge approximation shows that the differences between the exact and physical optics values are not attributable to a tip-excited wave.

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