The first stage of their design approach exploits fast concurrent optimisation of geometrically dependent, but electromagnetically isolated cells that constitute a BLC. Its vital usefulness in the process of microstrip line miniaturisation has been proved and experimentally validated on the basis of a compact 3-dB branch-line coupler illustrating the possibilities of the approach. Brain Research Bulletin doi The design approach presented here is a variation of sequential approximate optimization exploiting low-order local response surface models of the expensive 3D CFD simulations. An abbreviated wideband quarter-wave impedance matching transformer MT and a miniaturised hybrid branch-line coupler BLC have been developed. Czauderna M. Demonstration examples of a miniaturized rat-race coupler indicate that rapid and reliable design closure at a cost of two or three coupler simulations can be accomplished even for strong cross-couplings within the structure.
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The final results have been acquired in only a fraction of time that is necessary for a direct EM optimisation to generate competitive results.
James C. A design method of antenna array consisting of eight microstrip patches modified with Sierpinski fractal curves has been presented andexperimentally validated in this paper.
Publication Ethics. Doubly miniaturized rat-race hybrid coupler P.
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For this specific example, a set of ten designs representing a Pareto set for two objectives electrical performance and the layout area is identified at the cost corresponding to less than thirty high-fidelity EM simulations of the structure.
A class of hybrid RRCs with variable operating conditions is investigated, whose size reduction is obtained by replacing ordinary transmission lines with compact microstrip resonant cells CMRCs. The enhanced func-tionality of the developed circuits is achieved by means of slow-wave resonant structures SWRSsused as replacement components for conventional transmis-sion lines.
Doroty Jamroz T.
Publikacje Piotr Kurgan
The authors introduce a methodology for fast multi-objective design optimisation of miniaturised microwave couplers.
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A robust design of a numerically demanding compact rat-race coupler P.
BekasiewiczB. The experimental results are in excellent agreement with theoretical characteristics. A novel compact dual-band slot antenna fed by a coplanar waveguide CPW incorporating electromagnetic band gap EBG structures has been proposed. KurganS.
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|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.
Simultaneously, to achieve relatively constant microstrip impedance resulting in essentially low reflection losses, a modification of the strip geometry has been introduced. Our approach exploits nested space mapping NSM technology, where the inner SM layer is used to correct the equivalent circuit model at the CMRC level, whereas the outer layer enhances the coarse model of the entire structure under design.
A novel compact dual-band slot antenna fed by a coplanar waveguide CPW incorporating electromagnetic band gap EBG structures has been proposed. Proceedings p.