ABSTRACT
Transmission-line modeling (TLM), otherwise known as the transmission-line-matrix method, is a numerical technique time-domain for solving field problems using circuit equivalent. It is based on the equivalence between Maxwell's equations and the equations for voltages and currents on a mesh of continuous two-wire transmission lines. Unlike other methods such as finite difference and finite element methods, which are mathematical discretization approaches, the TLM is a physical discretization approach. In the TLM, the discretization of a field involves replacing a continuous system by a network or array of lumped elements. The great flexibility and versatility of the method reside in the fact that the TLM mesh incorporates the properties of electromagnetic fields and their interaction with the boundaries and material media. While TLM is a physical model based on Huygens' principle using interconnected transmission lines, the finite-difference time-domain (FDTD) is an approximate mathematical model directly based on Maxwell's equations.
