Abstract:  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.

Key words:  antithesis, coupled loop, coupling coefficient, transfer function