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In this paper, a methodology for fast re-design of antenna structures with respect to substrate parameters has been presented. The key component of our technique is an inverse surrogate model that is constructed using reference designs representing optimum antenna geometries for selected values of the substrate permittivity and thicknesses. The surrogate returns the values of antenna dimensions corresponding...
In the paper, a novel topology of a miniaturized wideband dual-band rat-race coupler has been presented. Small size of the circuit has been obtained by meandering transmission lines of the conventional circuit. At the same time, the number of independent geometry parameters has been increased in order to secure sufficient circuit flexibility in the context of its design optimization for dual-band...
In this paper, computationally efficient design optimization of a miniaturized dual-band microstrip branch-line coupler is presented. Our optimization approach relies on suitably extracted features of a highly nonlinear response of the coupler structure under design. By formulating the design objectives in terms of the feature point locations, we carry out iterative optimization of the linear model...
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