Variable-fidelity simulation-driven design optimisation of microwave structures
by Slawomir Koziel; Stanislav Ogurtsov; Leifur Leifsson
International Journal of Mathematical Modelling and Numerical Optimisation (IJMMNO), Vol. 3, No. 1/2, 2012

Abstract: The main obstacle in simulation-driven design optimisation of microwave structures is the high computational cost of high-fidelity electromagnetic (EM) simulation. In this paper, we discuss two computationally efficient design optimisation methodologies that exploit variable-fidelity electromagnetic models. The first technique is based on sequential optimisation of coarse-discretisation EM models. The optimal design of the current model is used as an initial design for the finer-discretisation one. The final design is then obtained in the refinement procedure that uses a polynomial approximation of the coarse-discretisation EM data. The unavoidable misalignment between the polynomial and the high-fidelity model is corrected using space mapping. The second technique also exploits coarse-discretisation EM model, however, the discrepancy between the lowand high-fidelity models is accounted for by appropriate adjustment of the design specifications. Our techniques are straightforward to implement and computationally efficient because the optimisation burden is shifted to the coarse-discretisation models. They are also applicable to virtually any type of microwave structures which is demonstrated using several design examples, including microstrip bandpass filter, planar ultrawideband antenna and a coplanar-waveguide-to-microstrip transition.

Online publication date: Wed, 20-Aug-2014

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