Étude théorique et numérique de problèmes de diffraction a trois dimensions

This work concerns three-dimensional diffraction problems involving a perfectly conducting obstacle of finite dimensions. The analysis does not necessarily imply symmetries of either the obstacle or the incident wave. Numerical solutions are obtained, by the moment method, of the integral equation of the second kind for the surface current density, and the field at points outside of the obstacle is calculated by a simple quadrature. The method is rigorous within the limits of numerical error. The calculations deal with the problem of the determination, in the resonance region, of the near field of a sphere and of a truncated paraboloid of revolution. This work has immediate applications in the study of the field in the neighborhood of a metallic electrode illuminated by a laser.