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Hybrid unconditionally stable high‐order nonstandard schemes with optimal error‐controllable spectral resolution for complex microwave problems
Author(s) -
Kantartzis Nikolaos V.
Publication year - 2012
Publication title -
international journal of numerical modelling: electronic networks, devices and fields
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.249
H-Index - 30
eISSN - 1099-1204
pISSN - 0894-3370
DOI - 10.1002/jnm.1846
Subject(s) - discretization , computer science , spurious relationship , wideband , finite element method , algorithm , linear subspace , polygon mesh , frequency domain , mathematics , mathematical analysis , electronic engineering , physics , geometry , machine learning , engineering , thermodynamics , computer graphics (images) , computer vision
SUMMARY A hybrid unconditionally stable time‐domain technique for the precise analysis and wideband performance characterization of 3D microwave systems is developed in this paper. Founded on a nontraditional differential discretization basis, the proposed technique launches a class of robust operators via an error‐controllable procedure that offers enhanced spectral resolution and optimal spatial stencils. The key asset of the frequency‐dependent algorithm is the novel high‐order nonstandard approximators, whose tensorial properties preserve the hyperbolic character of Maxwell's equations. In this manner, the resulting formulation remains completely explicit and generates effective dual meshes free of artificial vector parasites and spurious modes. Moreover, the preceding schemes are fruitfully hybridized, in the context of nonoverlapping subspaces, with an alternating‐direction implicit finite‐element time‐domain method in an effort to handle abruptly varying media boundaries and intricate geometries. Hence, an extensive decrease of dispersion errors is achieved, even when time‐steps are chosen appreciably beyond stability limits. These advanced simulation competences are successfully applied to diverse real‐world setups and composite configurations, thus validating the efficiency and universality of the proposed methodology. Copyright © 2012 John Wiley & Sons, Ltd.