Efficient numerical methods which analyse the coupling within an oblique transmission line network (OTLN) excited by electromagnetic wave are still rare in the literature. A novel time domain hybrid method is proposed in this article, in which finite-difference time-domain (FDTD) method, transmission line (TL) equations, Norton's theorem, and interpolation techniques are organically combined. In this method, the terminal loads and connection nodes of OTLN are first shifted to the center lines of FDTD grids, where the loads and nodes are located. Then the OTLN is divided into several independent oblique transmission lines according to the connecting nodes. Finally, the FDTD method combined with TL equations and interpolation techniques is applied to compute the transient responses on each oblique transmission line, and the Norton's theorem is utilized to build the equivalent circuit models of connecting nodes to realize the transmissions of interference signals on these oblique transmission lines. Numerical simulations of OTLN on the perfect conductor (PEC) ground and in a shielded cavity excited by ambient wave are employed to exhibit the accuracy and efficiency of the proposed method. Because the structure of OTLN does not need to be meshed, the proposed method outperforms the conventional FDTD method in both memory usage and computation time.

中文翻译：

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环境波激励斜传输线网络耦合分析的时域混合方法

分析由电磁波激发的斜传输线网络 (OTLN) 内耦合的有效数值方法在文献中仍然很少见。本文提出了一种新的时域混合方法，其中将有限差分时域(FDTD)方法、传输线(TL)方程、诺顿定理和插值技术有机地结合起来。在该方法中，OTLN 的终端负载和连接节点首先移动到 FDTD 网格的中心线，负载和节点所在的位置。然后将OTLN根据连接节点划分为若干独立的斜传输线。最后，结合 TL 方程和插值技术的 FDTD 方法被应用于计算每条斜传输线上的瞬态响应，以及 Norton' 利用s定理建立连接节点的等效电路模型，实现干扰信号在这些斜传输线上的传输。OTLN 在理想导体 (PEC) 地面和由环境波激发的屏蔽腔中的数值模拟被用来展示所提出方法的准确性和效率。由于OTLN的结构不需要进行网格划分，所提出的方法在内存使用和计算时间上都优于传统的FDTD方法。OTLN 在理想导体 (PEC) 地面和由环境波激发的屏蔽腔中的数值模拟被用来展示所提出方法的准确性和效率。由于OTLN的结构不需要进行网格划分，所提出的方法在内存使用和计算时间上都优于传统的FDTD方法。OTLN 在理想导体 (PEC) 地面和由环境波激发的屏蔽腔中的数值模拟被用来展示所提出方法的准确性和效率。由于OTLN的结构不需要进行网格划分，所提出的方法在内存使用和计算时间上都优于传统的FDTD方法。