Extensions to the hybrid method of moments/uniform GTD formulation for sources located close to a smooth convex surface

In this paper, we present an extension to the uniform geometrical theory of diffraction (GTD) for reflection from smooth curved surfaces. This approac h allows the source to be much closer to the reflecting surface than the co nventional uniform GTD formulation and does not require a Hertzian dipole s ource. In essence, the field point is mirrored in the plane tangential to t he specular (reflection) point; the incident field is then calculated at th e mirror point and the uniform GTD reflection coefficients are used to mirr or this held to the original held point. This formulation reduces exactly t o the conventional uniform GTD if the incident field is ray optical. The ap plication to a hybrid method of moments (MoM)/GTD code is outlined and resu lts computed using this code are presented for a dipole radiating in the vi cinity of a cylinder.