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A comprehensive study of numerical anisotropy and dispersion in 3-D TLM meshes

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2 Author(s)
Berini, Pierre ; Dept. de Genie Electr. et Inf., Ecole Polytech., Montreal, Que., Canada ; Ke Wu

This paper presents a comprehensive analysis of the numerical anisotropy and dispersion of 3-D TLM meshes constructed using several generalized symmetrical condensed TLM nodes. The dispersion analysis is performed in isotropic lossless, isotropic lossy and anisotropic lossless media and yields a comparison of the simulation accuracy for the different TLM nodes. The effect of mesh grading on the numerical dispersion is also determined. The results compare meshes constructed with Johns' symmetrical condensed node (SCN), two hybrid symmetrical condensed nodes (HSCN) and two frequency domain symmetrical condensed nodes (FDSCN). It has been found that under certain circumstances, the time domain nodes may introduce numerical anisotropy when modelling isotropic media

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:43 ,  Issue: 5 )

Date of Publication:

May 1995

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