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Robust reduced-order modelling of distributed linear networks

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3 Author(s)
C. S. Saunders ; Department of Electrical and Computer Engineering, North Carolina State University, Raleigh, NC 27695-7914, USA ; G. J. Mazzaro ; M. B. Steer

Foster's canonical form provides a causal bridge between the transfer function representation of the characteristics of a distributed structure and both time-domain and frequency-domain non-linear circuit simulation. It is particularly advantageous in modelling bandpass-like characteristics. In the modelling procedure, a transfer function having Foster's canonical form is fitted to measured or simulated data which may not have an inherent pole-zero description. Even if there is a good transfer function representation, the number of poles required for a reasonable fit is not known a priori which can lead to poor models that may cause convergence problems during either fitting or simulation. In this study, an extension of Foster's model is developed and a robust procedure for fitting the transfer function to data without a priori knowledge of the number of poles is presented. A robust stamp for implementation of the model in a transient circuit simulator is developed.

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IET Microwaves, Antennas & Propagation  (Volume:4 ,  Issue: 7 )