Fast surrogate-assisted simulation-driven optimization of compact microwave hybrid couplers. Issue 7 (2nd July 2016)

• Record Type: Journal Article
• Authors: Kurgan, Piotr; Koziel, Slawomir
• Is Part Of: Engineering optimization. Volume 48:Issue 7(2016)
• Page Start: 1109
• Page End: 1120
• Publication Date: 2016-07-02
• Subjects: computer-aided design -- compact circuits -- design optimization -- simulation-driven design; Engineering design -- Periodicals; Mathematical optimization -- Periodicals; 620.0042
• DOI: 10.1080/0305215X.2015.1097098
• Languages: English
• ISSNs: 0305-215X

Abstract

Abstract : This work presents a robust methodology for expedited simulation-driven design optimization of compact microwave hybrid couplers. The technique relies on problem decomposition, and a bottom–up design strategy, starting from the level of basic building blocks of the coupler, and finishing with a tuning procedure that exploits a fast surrogate model of the entire structure. The latter is constructed by cascading local response surface approximations of coupler elementary elements. The cross-coupling effects within the structure are neglected in the first stage of the design process; however, they are accounted for in the tuning phase by means of space-mapping correction of the surrogate. The proposed approach is demonstrated through the design of a compact rat-race and two branch-line couplers. In all cases, the computational cost of the optimization process is very low and corresponds to just a few high-fidelity electromagnetic simulations of respective structures. Experimental validation is also provided.