The electromagnetic (EM) reciprocity theorem of the time-convolution type is systematically applied to describe an EM-field-to-line coupling model interrelating the (actual) induced voltage and current quantities at the ends of a transmission line with the (testing) ones pertaining to the situation when the line operates as a transmitter. It is demonstrated that under certain conditions, the reciprocity-based coupling model is fully equivalent to the classic models of Agrawal, Taylor, and Rachidi. Furthermore, it is shown for the case of plane-wave incidence that the far-field amplitude radiated in the testing state can be used to replace the forcing functions that are traditionally expressed in terms of the excitation-field distribution along the transmission line. The reciprocity-based formulation is finally validated both analytically and numerically.

中文翻译：

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传输线的电磁场耦合——一种基于互易性的方法

时间卷积类型的电磁 (EM) 互易定理被系统地应用于描述将传输线末端的（实际）感应电压和电流量与（测试）与线路作为发射机运行时的情况有关。证明在一定条件下，基于互易性的耦合模型完全等价于 Agrawal、Taylor 和 Rachidi 的经典模型。此外，对于平面波入射的情况表明，在测试状态下辐射的远场幅度可用于代替传统上用沿传输线的激励场分布表示的强迫函数。