Abstract
Three new Transmission-Line Matrix (TLM) models applicable to two-dimensional electromagnetic field problems are presented. The unique properties of the new TLM models are related to the approximation of spatial derivatives in their equivalent Finite Difference algorithms. The significance of this work is to demonstrate that some of the inherent flexibility of the Finite Difference and Finite Element methods (i.e., various grid structures and altering the order of accuracy) is also applicable to the TLM method. The benefits associated with the increased flexibility are improved modelling of geometrical features and increased accuracy.
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