Field-Line Coupling Method for the Simulation of Gyromagnetic Nonlinear Transmission Line Based on the Maxwell-LLG System

Abstract

The gyromagnetic nonlinear transmission line (GNLTL) is a compact and solid-state high-power microwave source, which can be treated as a special coaxial transmission line partially filled with the ferrite material. Due to the complex interaction process of the electromagnetic fields with the dynamic damped precessional motion of the magnetization vector in the ferrite, it is of great challenge to theoretically predict the output of the GNLTL. Here, we present a novel field-line coupling simulation method to predict the output waveform of the GNLTL by simultaneously solving the coupled system of the Landau-Lifshitz-Gilbert equation and Maxwell's equations in the 2-D cylindrical coordinate system. In particular, the simulation model is validated by comparing the computation results with the experimental results obtained by Bragg et al. in the HPM experiment. The influences of the GNLTL length and bias magnetic field are analyzed. The proposed computation method can provide a solution for improving the performance of the GNLTL.