A novel parametric macromodeling technique for electromagnetic structures with propagation delays

This work addresses the problem of building accurate and stable parametric macromodels for distributed electronic structures with propagation delays. First, reduced root macromodels are calculated by means of Delayed Vector Fitting technique at estimation points of the design space grid. Then, a suitable interpolation scheme for the delay trends and rational terms is proposed, preserving the model stability over the entire design space. The fundamentals of the identification scheme are discussed, and some insight on basic robustness and accuracy problems is provided. A couple of significant case studies are reported to demonstrate the accuracy and efficiency of the presented technique.