| Computational electromagnetics, as applied to the modeling of high frequency structures and circuits has been dominated by the use of integral equations solved in the spectral domain. The reason the spectral domain has been used is to avoid the difficult calculation of the associated Green's functions, generally in the form of Sommerfeld integrals. Recent advances have shown that the mixed potential integral equation solved in the spatial domain is a viable technique when the Green's functions can be cast into closed form. These closed-form Green's functions dramatically increase efficiency however they are difficult to calculate without prior knowledge of the Green's function behavior. This work proposes a modified approach by stopping short of making the Green's function fully closed form and integrating a modified kernel which is smoother. In this way it is able to achieve computational efficiency while it is more robust and general purpose. This work also develops methods to enhance the simplicity and efficiency of the mixed potential integral equation/moment method technique. Close agreement has been obtained between results computed using this method and measured and calculated data published in the literature. |
