Mixed-mode S-parameter conversion for networks with coupled differential signals

@article{Huynh2007MixedmodeSC,
  title={Mixed-mode S-parameter conversion for networks with coupled differential signals},
  author={Allan Huynh and P{\"a}r H{\aa}kansson and Shaofang Gong},
  journal={2007 European Microwave Conference},
  year={2007},
  pages={238-241}
}
It is shown in this paper that the commonly used method for converting from standard single-ended to mixed- mode S-parameters for networks with differential signaling only works for odd- and even-mode impedance equal to 50Omega. A correct conversion matrix equation must include the odd- and even-mode impedances which are not equal to the unique characteristic impedance owing to signal coupling in the network. 
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