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The higher order mixed spectral-element method (SEM) is proposed for the analysis of anisotropic, lossy, and open waveguides. The new variational formulation incorporating Gauss’ law into the vectorial wave equation is completely free of spurious modes. It utilizes the edge-based curl-conforming Gauss–Lobatto–Legendre (GLL) polynomials to approximate the tangential vector of the electric field and...
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