A hybrid method of moments-improved UTD formulation for the radiation of a linear antenna in the presence of a wedge

The authors apply the improved UTD (uniform geometrical theory of diffraction) by O.M. Buyukdura and R.G. Kouyoumjian (1985) to the problem of the radiation from a monopole antenna mounted closed to the edge of a perfectly conducting edge. The primary aim is to test the accuracy of the improved UTD as compared to that of the ordinary UTD. A by-product of the formulation is that it can be used to assess the effect of the vicinity of an edge to the radiation pattern of an antenna. This finds application in antenna ranges where measurements are made with antennas placed on finite ground planes in the hope of approximating an infinite ground plane. The present formulation can be used to determine the size of a ground plane in order to keep the error arising from the finiteness thereof within acceptable limits