Title :
Absorbing-boundary conditions using perfectly matched-layer (PML) technique for three-dimensional TLM simulations
Author :
Peña, Nestor ; Ney, Michel M.
Author_Institution :
Lab. for Electron. & Commun. Syst., Ecole Nat. Superieure des Telecommun. de Bretagne, Brest, France
fDate :
10/1/1997 12:00:00 AM
Abstract :
This paper describes the algorithm that interfaces the three-dimensional (3-D) transmission-line matrix (TLM) with an absorbing-boundary condition (ABC) based on the perfectly matched-layer (PML) approach. The algorithm uses a coupling between the TLM symmetrical condensed node (SCN) network and a finite-difference approximation of the PML equations. Examples are presented in scattering problems and S-parameter characterization of discontinuities. Excellent results are found even with absorbing walls located in the region of evanescent waves. Absorption performances obtained are significantly superior to ABC´s based on the one-way equation approach and currently used for TLM simulations. Finally, it is found that for all tested situations, the algorithm is numerically stable
Keywords :
S-parameters; electromagnetic wave absorption; electromagnetic wave scattering; finite difference time-domain analysis; numerical stability; transmission line matrix methods; 3D TLM simulations; 3D transmission-line matrix method; EM waves; FDTD; PML technique; S-parameter characterization; TLM SCN network; TLM symmetrical condensed node network; absorbing walls; absorbing-boundary conditions; absorption performance; discontinuities; evanescent waves; finite-difference approximation; numerically stable algorithm; perfectly matched-layer technique; scattering problems; three-dimensional TLM simulations; Absorption; Approximation algorithms; Couplings; Equations; Finite difference methods; Scattering parameters; Symmetric matrices; Testing; Transmission line matrix methods; Transmission lines;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on