VARIABLE-FIDELITY DESIGN OPTIMIZATION OF MICROWAVE DEVICES USING MULTI-DIMENSIONAL CAUCHY APPROXIMATION AND COARSELY DISCRETIZED ELECTROMAGNETIC MODELS

Abstract

Application of multi-dimensional Cauchy approximation and coarse-discretization electromagnetic (EM) models to surrogate- based optimization of microwave structures is discussed. Space mapping is used as an optimization engine with the surrogate model constructed as a Cauchy approximation of the coarsely discretized device EM model. The proposed approach allows us to perform computationally e-cient optimization of microwave structures without using circuit-equivalent coarse models traditionally exploited by space mapping algorithms. We demonstrate our technique through design of a range of microwave devices, including fllters, antennas, and transitions. Comprehensive numerical veriflcation of the proposed methodology is carried out with satisfactory designs obtained | for all considered devices | at a computational cost corresponding to a few full-wave simulations.