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针对两线一地构成的耦合传输线，导出其正弦电压、电流相量方程．方程中具有和型二次参数波阻抗Ｚｃ１和传播常数γ１以及差型二次参数波阻抗Ｚｃ２和传播常数γ２．提出在耦合传输线终端开路和短路的条件下．通过在起端测试．确定这两组二次参数的原理和方法．经实验验证本文提出的耦合传输线参数测试方法是有效的．
Aiming at the coupled transmission line formed by two lines and one, the sinusoidal voltage and current phasor equations are derived. The equation has the sum of the quadratic parameter wave impedance Zc1 and the propagation constant γ1 and the difference quadratic wave impedance Zc2 and the propagation constant γ2. Proposed in the coupled transmission line terminal open and short circuit conditions. Pass the test at the beginning. Determine the principle and method of these two sets of second parameters. The experimental verification of the proposed transmission line parameters testing method is valid.