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Grid dispersion error using the nonuniform orthogonal finite‐difference‐time‐domain method
Author(s) -
And John Svigelj,
Mittra Raj
Publication year - 1995
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.4650100402
Subject(s) - finite difference time domain method , grid , dispersion (optics) , limit (mathematics) , polygon mesh , wavelength , finite difference method , computer science , mathematics , time domain , mathematical analysis , algorithm , optics , geometry , physics , computer vision
Memory requirements often limit the scope of problems that can be solved using the finite‐difference—time‐domain (FDTD) method. However, problems involving complicated geometries with fine features and large geometries can be more readily handled using nonuniform orthogonal FDTD. Grid dispersion error on nonuniform meshes is addressed in this communication. The critical parameters of cell size in terms of wavelength and growth rate are studied. A theoretical analysis followed by a numerical example demonstrate that grid dispersion error can be held to acceptably small levels. © 1995 John Wiley & Sons, Inc.