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A numerical absorbing boundary condition for quasi‐TEM analysis of microwave transmission lines using the finite‐element method
Author(s) -
PanticTanner Zorica,
Mavronikolas George,
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.4650090308
Subject(s) - finite element method , boundary value problem , boundary (topology) , truncation (statistics) , mathematical analysis , mathematics , numerical analysis , transmission (telecommunications) , microwave , engineering , structural engineering , telecommunications , statistics
This article presents a new numerical absorbing boundary condition useful for quasi‐TEM analysis of open‐type microwave transmission lines employing the finite‐element method (FEM). The standard FEM equations are used for the inner nodes of the mesh, and mesh truncation is achieved by imposing linear relationships for the nodes on the outer boundary and their neighbors, which are derived from the appropriate Green's functions. This approach greatly reduces the mesh size, while preserving the sparsity of the FEM equations. Higher‐order approximations of the absorbing boundary condition are derived through the use of higher‐order finite elements. © 1995 John Wiley & Sons, Inc.