Ergül, ÖzgürGürel, Levent2016-02-082016-02-0820090018-926Xhttp://hdl.handle.net/11693/22698We consider electromagnetics problems involving composite geometries with coexisting open and closed conductors. Hybrid integral equations are presented to improve the efficiency of the solutions, compared to the conventional electric-field integral equation. We investigate the convergence characteristics of iterative solutions of large composite problems with the multilevel fast multipole algorithm. Following a thorough study of how the convergence characteristics depends on the problem geometry, formulation, and iterative solvers, we provide concrete guidelines for efficient solutions.EnglishHybrid formulationsIterative methodsMultilevel fast multipole algorithmSurface integral equationsArticle10.1109/TAP.2009.2019921