Modal S-parameters and the circuit representation of symmetric circuits

This paper presents guidelines for circuit analysis using symmetry, which is an extension of Bartlett´s bisection theorem. The theory of modal S-parameters and the circuit representation are constructed from a group-theoretic perspective. The principles are explained with a simple circuit as an example. As a result, a finite combination of smaller circuits can characterize an entire circuit. This allows for easier understanding of the behavior. An analysis of a three-phase filter is performed as an application example.