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Split and Unsplit Finite-Volume Absorbers: Formulation and Performance Comparison

Time-domain models of split and unsplit finite-volume absorbers (FiVA) used as perfectly matched layer (PML) are analyzed in this paper. These models are employed on unstructured meshes in the framework of the finite-volume time-domain (FVTD) method. A systematic comparison with emphasis on the differences in their mathematical construct and dynamic performance is presented. Numerical analysis on the absorber thickness and loss-parameter is carried out to study the limitations of these absorber models. Numerical reflection coefficients in the range of -80 dB are achieved demonstrating the capability of these models