ON THE ELIMINATION OF INFINITIES IN THE PO COMPONENT OF EQUIVALENT EDGE CURRENTS

Equivalent edge currents for the Physical Optics (PO) contribution to the edge diffraction are derived by choosing a proper coordinate syste m for a half plane. It is seen that these expressions for the PO compo nent are free from singularities except at shadow and reflection bound aries on the Keller Cone. To find the total diffracted field, the expr essions for the fringe contribution given earlier by Michaeli should b e used along with the PO contribution obtained here. The procedure is applied to the problems of backscattering from square and triangular p lates. Higher order diffractions are also accounted for by combining t he equivalent currents with the Uniform Theory of Diffraction (UTD). T he results obtained are compared with previous solutions and measured data.