NDLI: Rapid design of miniaturised branch-line couplers through concurrent cell optimisation and surrogate-assisted fine-tuning

Content Provider	IET Digital Library
Author	Koziel, Slawomir Kurgan, Piotr
Abstract	In this study, the authors introduce a methodology for low-cost simulation-driven design optimisation of highly miniaturised branch-line couplers (BLCs). The first stage of their design approach exploits fast concurrent optimisation of geometrically dependent, but electromagnetically isolated cells that constitute a BLC. The cross-coupling effects between the cells are taken into account in the second stage, where a surrogate-assisted fine-tuning procedure is executed. The tuning process is based on space-mapping-enhanced low-fidelity model of the entire BLC. The latter is constructed by cascading local response surface approximations (RSAs) of the BLC building blocks. The efficiency of their technique is demonstrated through the design of two compact BLCs. A considerable scale of miniaturisation has been achieved in both cases (83.7 and 87.4%, respectively), at the computational cost corresponding to a few EM simulations of the respective BLC. Comparison of numerical results with several surrogate-based design approaches as well as an experimental verification of the final designs are also provided.
Starting Page	957
Ending Page	963
Page Count	7
ISSN	17518725
Volume Number	9
e-ISSN	17518733
Issue Number	Issue 9, Jun (2015)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/9/9
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2014.0600
Journal	IET Microwaves, Antennas & Propagation
Publisher Date	2015-03-17
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Approximation Theory BLC Concurrent Cell Optimisation Cross-coupling Effects Design Optimisation Electromagnetic Coupling Electromagnetically Isolated Cell EM Simulations Interpolation And Function Approximation Low Fidelity Model Microwave Circuit And Device Miniaturised Branch Line Coupler Numerical Analysis Optimisation Optimisation Technique Radio Wave Propagation Response Surface Approximation Response Surface Methodology RSA Surrogate Assisted Fine Tuning Procedure
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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