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J Electromagn Eng Sci > Volume 16(1); 2016 > Article
Journal of Electromagnetic Engineering and Science 2016;16(1):57-66.
DOI: https://doi.org/10.5515/JKIEES.2016.16.1.57   
Mode Analysis of Cascaded Four-Conductor Lines Using Extended Mixed-Mode S-Parameters
Nan Zhang, Wansoo Nah
Department of Electronic and Electrical Engineering, Sungkyunkwan University
Correspondence:  Wansoo Nah,Email: wsnah@skku.edu
Abstract
In this paper, based on the mode analysis of four-conductor lines, the extended mixed-mode chain-parameters and S-parameters of four-conductor lines are estimated using current division factors. The extended mixed-mode chain-parameters of cascaded four-conductor lines are then obtained with mode conversion. And, the extended mixed-mode S-parameters of cascaded four-conductor lines can be predicted from the transformation of the extended chain-parameters. Compared to the extended mixed-mode S-parameters of four-conductor lines, the cross-mode S-parameters are induced in the extended mixed-mode S-parameters of cascaded four-conductor lines, due to the imbalanced current division factors of cascaded two sections. The generated cross-mode S-parameters make the equivalent different- and common-mode conductors not independent from each other again. In addition, a new mode conversion, which applies the imbalanced current division factors, between the extended mixed-mode S-parameters and standard S-parameters is also proposed in this paper. Finally, the validity of the proposed extended mixed-mode S-parameters and mode conversion is confirmed by a comparison of the simulated and estimated results of shielded cable.
Key words: Cascaded, Current Division Factors, Extended Mixed-Mode S-Parameters, Four-Conductor Lines, Mode Analysis
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