Theory, Simulation, and Experiment on Extended Mixed-Mode S-Parameters in Three-Conductor Lines

This paper proposes novel mixed-mode S-parameters, which are dubbed as “extended mixed-mode S-parameters.” The extended mixed-mode S-parameters were applied to three-conductor transmission lines, resulting in the independent differential and common modes using the current division factor of three-conductor transmission lines. By contrast to the conventional mixed-mode S -parameters, there are no cross-mode S-parameters in the extended mixed-mode S -parameters, even in the asymmetrical conductor transmission lines. In addition, two new mode conversion matrices, which contain the current division factor, are also proposed to convert the extended mixed-mode S -parameters to the standard S-parameters. The validity of the proposed extended mixed-mode S -parameters and the mode conversion method were confirmed by comparing the S-parameters from the theory, EM-simulation, and experiment as well.