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We introduce a kernel-independent wideband nested equivalent source approximation method. The nested equivalent source approximation (NESA), proposed by these authors to solve low frequency problems with linear complexity, is extended here to electrically large multiscale structures. The low frequency algorithm is directly employed at the bottom levels of an Octree clustering; in the high frequency...
Wepresent a new developed rank based method, namely the Wideband Nested Equivalent Source Approximation (WNESA) method for multiscale problems. The low rank approximation of WNESA is constructed after introducing equivalent vector source distributions on properly defined equivalence surfaces enclosing the coupling groups. The equivalent vector sources are determined by an inverse-source process that...
A doubly hierarchical method of moments (MoM) is proposed for the analysis of large scale multiscale structures. The separate handling of the high and low frequency interactions of the MLMCM/MLFMA is exploited to efficiently analyze multi-scale structures; the resulting system is further preconditioned following the MR-ILU approach, which has proven successful for solving multi-scale complex structures...
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