The far-field radiation of the transmission line (TL) operating as a transmitter and the induced voltage and current at the terminals of the TL regarded as a receiver can be correlated via the electromagnetic (EM) reciprocity theorem. For a TL above an orthogonal ground plane, the far-field radiation formulas of the TL in the testing state (where the TL is deemed as a transmitter) and the electric field expressions around the TL in the receiving state (where the TL is considered as a receiver) are derived in this study. Besides, an expression for the induced voltage at the terminal of the TL is obtained for each state and the equivalence between the two expressions is proved through the EM reciprocity theorem and method of image. A voltage source is selected as the excitation in the testing state and an effective selection method is proposed. Moreover, numerical examples are provided to verify the correctness of analyzing the field line coupling problem of the TL above an orthogonal ground plane through the EM reciprocity theorem and to certify the effectiveness of the novel expression of the excitation voltage source.

中文翻译：

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通过电磁互易定理分析正交地平面上方传输线的场线耦合

作为发射器运行的传输线 (TL) 的远场辐射与被视为接收器的 TL 端子处的感应电压和电流可以通过电磁 (EM) 互易定理相关联。对于正交地平面上方的 TL，测试状态（将 TL 视为发射机）的 TL 的远场辐射公式和处于接收状态（其中将 TL 视为发射机）的 TL 周围的电场表达式作为接收器）是在本研究中得出的。此外，还得到了每个状态的TL端感应电压的表达式，并通过EM互易定理和图像方法证明了这两个表达式之间的等价性。在测试状态下选择电压源作为激励源，并提出了一种有效的选择方法。