New procedures for 2-D and 3-D microwave circuit analysis with the TLM method

Four contributions to numerical field modeling with the TLM (transmission line matrix) method are presented: (1) the formulation of a 3-D Johns matrix (or numerical Green´s function) for wideband non-TEM (transverse electromagnetic)-absorbing boundary conditions using the 3-D condensed TLM node; (2) use of a tapered Johns matrix (or numerical Green´s function) for improving the return loss of frequency dispersive absorbing boundaries; (3) a recursive algorithm for wideband non-TEM absorbing boundary modeling; and (4) a pseudoparallel iteration scheme for the simultaneous processing of TLM substructures. These procedures are essential for efficient time-domain modeling of 3-D waveguide discontinuities of arbitrary geometries. Their application saves considerable computer run-time and memory when compared with conventional TLM analysis.<>