通过对电路中电感和电容的对偶性质进行分析，介绍了一种用于电容耦合回路耦合系数的新定义方法，该方法与传统方法相比，可以方便地计算耦合系数.同样利用对偶的方法，分析了两类耦合电路的传输函数，得到了完美的对偶形式.为耦合振荡电路的研究和教学提供了一种新的方法.

 An analysis of the coupling circuit is conducted based on the dual properties of inductance and capacitance. This analysis introduces a novel method for defining the coupling coefficient in the capacitive coupling circuits, enabling a more straightforward calculation of the coupling coefficient. Similarly, by applying the dual method, the transfer function is examined, resulting in a perfectly symmetric form. This method offers a new approach to research and teaching coupled oscillation circuits.