Broadband physics-based modeling of microwave passive devices through frequency mapping

We present a new computer-aided modeling methodology to develop physics-bas ed models for passive components. We coherently integrate full-wave electro magnetic simulators, artificial neural networks, multivariable rational fun ctions, dimensional analysis, and frequency mapping to establish broadband models, We consider both frequency-independent and frequency-dependent empi rical models. Frequency mapping is used to develop the frequency-dependent empirical models, Useful properties of the frequency mapping are presented and utilized in the modeling process, We also consider the transformation f rom frequency-dependent models into frequency-independent ones in addition to the passivity of the frequency-dependent empirical model, We illustrate the modeling process through various examples, including a microstrip right angle bend, a microstrip via, a microstrip double-step (to be used as a ba sic element of constructing a model for nonuniform or tapered microstrip tr ansmission lines), and a coplanar waveguide step junction, (C) 2001 John Wi ley & Sons, Inc.