An enhanced fraction polynomial microwave filter modeling method exploiting space mapping

Abstract

ABSTRACTA method for bandpass filter modeling taking advantage of the space mapping (SM) is presented in this letter. The coarse model is constructed by the fraction polynomial approximating the data from high‐fidelity simulations, and the approach of obtaining the coefficients is specifically designed to avoid rapidly increasing complexity as the data adds. The surrogate model, which the accuracy is further enhanced, is established utilizing SM. In this work, the SM process allows a flexible tradeoff between accuracy and computational cost. The proposed model can be operated with a relatively wide variation of design variables and is practical for arbitrary bandwidth filter. Couple line filters and an ultrawideband (UWB) radial‐stub‐loaded filter are modeled using the proposed modeling method to validate its merits and the result shows a good performance. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1159–1163, 2016