Title :
A comprehensive study of numerical anisotropy and dispersion in 3-D TLM meshes
Author :
Berini, Pierre ; Wu, Ke
Author_Institution :
Dept. de Genie Electr. et Inf., Ecole Polytech., Montreal, Que., Canada
fDate :
5/1/1995 12:00:00 AM
Abstract :
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
Keywords :
frequency-domain analysis; numerical analysis; time-domain analysis; transmission line matrix methods; 3-D TLM meshes; anisotropic lossless media; frequency domain symmetrical condensed nodes; hybrid symmetrical condensed nodes; isotropic lossless media; isotropic lossy media; mesh grading; numerical anisotropy; numerical dispersion; simulation; symmetrical condensed node; time domain nodes; Analytical models; Anisotropic magnetoresistance; Computational modeling; Dispersion; Equations; Frequency domain analysis; Numerical models; Performance analysis; Propagation constant; Time domain analysis;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
