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Time-Domain volumic methods in electromagnetics, such as Finite-Difference (FDTD), Finite Integration Technique (FIT) or Transmission-Line Matrix (TLM) methods are investigated when dealing with structures that contain interfaces separating media with highly different constitutive parameters. Similar issues appear when dealing with adjacent irregular structured meshes with high step-size ratio. Simulation...
Inherent to time-domain method that use space-time discretization, the model dispersion produces field propagation velocity error. In methods such as finite-differences or TLM in time domain, it is customary to choose a maximum mesh size of one tenth of the minimum operating wavelength. If this criterion is easily applicable for normal ordinary media, it is more ambiguous to give interpretation of...
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