Full-Wave FDTD Modeling and Simulation of Nonlinear Transmission Lines

We present a numerical scheme for simulating a ferrite loaded nonlinear transmission line (NLTL). The numerical scheme is an extension of the well known finite-difference time-domain (FDTD) method. The method couples Maxwell's equations with the nonlinear Landau-Lifshitz-Gilbert (LLG) equation for modeling the dynamics of ferrite material. Furthermore, the method discretizes the domain using the staggered Veegrid with the magnetization vectors (M-fields) located at cell centers; the usual FDTD electric field and magnetic field updates are unchanged. We then validate the method and model by comparing simulation results with an Air Force Research Laboratory (AFRL) high-power NLTL experiment.