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A balanced absorber with both electric and magnetic conductances can be placed within the null field inside a scatterer, helping reduce interactions between pairs of opposing basis functions. The resultant MoM matrix is severely thinned with all but a few percent of the original elements being annulled.
A two dimensional implementation of the source decomposition method (SDM) is presented in comparison with the PML and Higdon absorbing boundary conditions for FDTD applications. The SDM is global in nature, however it can accommodate reflective external domains. The comparison shows that the results are of similar quality, indicating that the Higdon conditions can be a viable choice at a lower cost...
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