Efficient TLM Diakoptics for Separable Structures

M. Righi, W. J. R. Hoefer, M. Mongiardo and R. Sorrentino

IEEE Transactions on Microwave Theory and Techniques, April 1995, Vol. 43, No. 4, pp 854-859.


An efficient yet rigorous application of diakoptics to TLM simulation of discontinuities in homogeneously filled waveguides is proposed. The method, based on the expansion of the time-domain Green's function into frequency independent eigenfunctions, leads to a dramatic reduction of the numerical effort when compared to the standard Johns Matrix approach. Numerical results show that this new approach provides wide band absorbing boundaries for waveguide problems where several modes (whether propagating or evanescent) are present. In this way, the computational domain is also reduced to just a small region around the discontinuity, with the absorbing boundaries placed just a few cells away.

This paper logically precedes the paper "Efficient 3D-SCN-TLM Diakoptics for Waveguide Components" in the December 1994 issue of the transactions although it was published later.

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