The medium matrix is given by
where ρk,r is the volume density of (inertial) mass and St,j,p,q is the compliance.
For electromagnetic waves the spatial differential operator in the system of (3.12) is given by
The medium matrix is found to be
where εk,r is the permittivity and μJ,P is the permeability.
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3 ACOUSTIC, ELASTODYNAMIC, AND ELECTROMAGNETIC WAVEFIELD COMPUTATION - A STRUCTURED APPROACH BASED ON RECIPROCITY ."
Large-Scale Structures in Acoustics and Electromagnetics: Proceedings of a Symposium . Washington, DC: The National Academies Press,
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