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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

Generalized scattering parameters and the impedance matrix of multimode quasi‐TEM networks are related using a normalization impedance matrix. The corresponding formula appears to be an extension of the usual single‐mode multiports ones. Theoretical and measured parameters are compared for a multimode one‐port and an asymmetrical coupled‐strip four‐port. ©1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 20: 214–218, 1999.

In this article we take into account the influence of the superconducting nature of the strip in order to study the behavior of the superconducting microstrip line by means of two numerical methods. The first one is the spectral domain approach modified by the surface impedance concept and the second one is the modified mode‐matching technique. This last one allows more accurate simulation of the presence of the superconducting strip without using surface impedance approximation. In a second step we present the corrections brought to the modified SDA in order to obtain accurate results by this more versatile numerical method, which consumes small amounts of CPU time.