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.

中文翻译：

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基于Maxwell-LLG系统的旋磁非线性传输线仿真的场线耦合方法

旋磁非线性传输线（GNLTL）是一种紧凑的固态大功率微波源，可以看作是部分填充铁氧体材料的特殊同轴传输线。由于电磁场与铁氧体中磁化矢量的动态阻尼进动运动的复杂相互作用过程，从理论上预测GNLTL的输出具有很大的挑战。在这里，我们提出了一种新的场线耦合仿真方法，通过在二维圆柱坐标系中同时求解 Landau-Lifshitz-Gilbert 方程和麦克斯韦方程的耦合系统来预测 GNLTL 的输出波形。特别是，通过将计算结果与 Bragg 等人获得的实验结果进行比较来验证仿真模型。在 HPM 实验中。分析了GNLTL长度和偏置磁场的影响。所提出的计算方法可以为提高 GNLTL 的性能提供解决方案。