Analysis of arbitrarily-shaped radiators and scatterers by a partial-domain moment method.

摘要

This dissertation presents a comprehensive implementation of a partial-domain moment method technique useful for computing electromagnetic radiation and scattering. The basis functions are linearly varying, and some are novel. A new method of joining wires to surfaces is developed, and the method does not assume that wires are infinitesimally thin. The technique applies to objects of small to moderate size with dielectric and metallic components. The materials may be arbitrarily shaped provided they can be adequately modeled with triangles, rings, cylinders, or tetrahedra. Techniques of speeding the implementation and improving its accuracy are investigated with enough success that the matrix solution time dominates the matrix-fill time for most problems. Various sources are investigated including the plane wave, the extended delta gap, the delta gap, and the magnetic frill. The magnetic frill implementation is more accurate than conventional implementations. Other calculations, including radar cross section, gain, and input impedance, are developed for the appropriate sources. The resulting algorithm is applied to various canonical and non-canonical cases including dipoles, a loop of wire, a capacitor, a square metallic plate, a free-space Archimedian round spiral, a dielectric disk, a dielectric-coated wire, a dielectric-coated sphere, and a square Archimedian spiral over a finite ground plane.