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The standard staggered grid for Maxwell’s equations is awkward for anisotropic media because the different components of the electric and magnetic fields are located at different nodes. There is, however, a natural alternative that places all components of the electric field at each node of one grid and all components of the magnetic field at each node of a staggered grid. This staggering allows a conservative finite-difference approximation for Maxwell’s equations with arbitrary 3-D tensor electrical conductivity, magnetic permeability, and dielectric permittivity. An example of the time-domain solution using spectral Lanczos decomposition is considered.

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