A finite-element-based model order reduction method for the broadband analysis of the dominant modes of transversally inhomogeneous waveguides is presented. We show that the sub-space projections used in conventional multipoint methods may result in spurious modes in the reduced-order model and propose an improved formulation to overcome this problem. The suggested method achieves error levels comparable to those of the underlying finite-element method, while overall solution times are significantly smaller.
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Schultschik et al. (2008) studied this question.
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