Preconditioning of a low-frequency electric field integral equation formulation with circuit coupling using H-matrices

A New Strategy for Automatic Coupling Between the Inductive PEEC Method and an Integral Electrostatic Formulation

“…An important research effort has been carried out on the subject. Much work has focused on the development of efficient preconditioning techniques in order to accelerate convergence [18], [17]. This topic of research is still very active because no "universal" preconditioner has yet been exhibited.…”