带慢波结构的同轴旋磁非线性传输线：2D/3D 有限差分时域（FDTD）建模
Coaxial Gyromagnetic Nonlinear Transmission Line with a Slow-Wave Structure: 2D/3D FDTD Modeling
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中文总结 AI 辅助
本文针对同轴旋磁非线性传输线的高介电常数材料损耗问题，提出带螺旋中心导体的3D FDTD模型，模拟证实其可生成长振荡包且损耗低、效率高。
中文摘要 AI 辅助
同轴旋磁非线性传输线（GNLTL）可实现0.3-10 GHz范围内的脉冲前沿压缩与振荡包生成。此类系统的数值建模通常采用2D轴对称FDTD方案，并结合全非线性朗道-利夫希茨-吉尔伯特方程的并行求解。此前研究表明，使用介电常数ε>60的绝缘介质可通过类切伦科夫效应生成持续振荡，但这类极高介电常数材料（如水）固有的严重高频损耗限制了实际应用。为克服该局限并提升性能，本文提出一种新型设计：采用螺旋中心导体模拟高介电常数环境，铁氧体置于螺旋内部。因轴对称性丧失，FDTD模型扩展至3D坐标。模拟证实，螺旋导体结构可生成与高介电常数介质波导类似的持续振荡包，且损耗显著降低、能量传输效率提升。
英文摘要
A coaxial gyromagnetic nonlinear transmission line (GNLTL) enables pulse-front compression and oscillation packet generation in the 0.3-10 GHz range. Numerical modeling of such systems typically employs a 2D axially symmetric FDTD scheme coupled with the parallel solution of full non-linearized Landau-Lifshitz-Gilbert equations. Previous studies have shown that using an insulating dielectric with a permittivity $ε$>60 enables the generation of long-lasting oscillations via a Cherenkov-like effect. However, practical implementation is limited due to the severe high-frequency losses inherent in materials with such extreme permittivity, like water. To overcome this limitation and enhance performance, we propose a novel design utilizing a spiral central conductor to mimic a high-permittivity environment, with the ferrite placed inside the spiral. Due to the loss of axial symmetry, the FDTD model was extended to 3D coordinates. Simulations confirm that the spiral conductor configuration generates a prolonged oscillation packet similar to that of a high-permittivity dielectric waveguide, but with significantly reduced losses and improved energy transfer efficiency.
