This paper introduces a two-port network based approach to model capacitive wireless power transfer systems. A simple, generic and unified model to describe capacitive WPT system, under variations has been developed. The behavioral model and methodology have been validated through simulations and experiments. A 75W experimental capacitive WPT prototype has been designed and examined for various operating conditions, at switching frequency of 1.55MHz. A very good agreement is obtained between the theoretical behavioral model predictions, simulations, and measured experimental results.