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.

EM Subnetworks, Measured Data, Passive Macromodels, Scattering Parameters, Transient Analysis
2005 IEEE MTT-S International Microwave Symposium
Department of Electronics

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