FOCAL REGION FIELDS OF DISTORTED REFLECTORS

The problem of the focal region fields scattered by an arbitrary surfa ce reflector under uniform plane wave illumination is solved. The phys ical-optics (PO) approximation is used to calculate the current induce d on the reflector. The surface of the reflector is described by a num ber of triangular domain-wise fifth-degree bivariate polynomials. A tw o-dimensional Gaussian quadrature is employed to numerically evaluate the integral expressions of the scattered fields. No Fresnel or Fraunh ofer approximations are made. The relation of the focal fields problem to surface compensation techniques and other applications are mention ed. Several examples of distorted parabolic reflectors are presented a nd discussed.