Circuit modeling of networks described by tabulated S-parameters has generated immense interest during the recent years. The tabulated data may be obtained either from measurements or full-wave EM simulations. However, one of the major difficulties with such type of data is that, the data can be non-passive in the frequency bandwidth of interest, due to the measurement errors or the numerical errors associated with the full-wave simulator. This causes significant difficulty while interfacing such a data with circuit simulators. To overcome this difficulty, this paper presents an efficient algorithm for restoring the passivity of the S-parameter data, prior to its circuit modeling. Numerical examples are presented to demonstrate the validity and efficiency of the proposed algorithm.

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Keywords EM Subnetworks, Measured Data, Passive Macromodels, Scattering Parameters, Transient Analysis
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Conference 2005 IEEE MTT-S International Microwave Symposium
Saraswat, D., Achar, R, & Nakhla, M.S. (2005). Restoration of passivity in S-parameter data of microwave measurements. In IEEE MTT-S International Microwave Symposium Digest (pp. 1131–1134). doi:10.1109/MWSYM.2005.1516872