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The paper presents a design of an ultra-wideband (UWB) antenna with an integrated balun. A fully planar balun interfacing the microstrip input of the structure to the coplanar stripline (CPS) input of the dipole antenna is introduced. The electromagnetic (EM) model of the structure includes the dipole, the balun, and the microstrip input to account for interactions over the UWB band. The EM model...
Explicit size reduction of antenna structures using cost efficient EM-simulation-driven optimization is discussed. The proposed approach directly handles the antenna size (as the main design objective) while ensuring satisfaction of electrical performance parameters by means of suitably defined penalty functions. For the sake of computational efficiency, optimization is carried out using cheap adjoint...
Cost-efficient multi-objective design of antenna structures is presented. Our approach is based on design space reduction algorithm using auxiliary single-objective optimization runs and coordinate system rotation. The initial set of Pareto-optimal solutions is obtained by optimizing a response surface approximation model established in the reduced space using coarse-discretization EM simulation data...
Expedited design optimization of compact microwave structures using adjoint sensitivities and space mapping (SM) is proposed. For the sake of computational efficiency and good generalization capability, we utilize coarse-discretization electromagnetic (EM) simulation models which are suitably corrected using SM. The mapping parameters are evolving together with the design itself (no fully converged...
The paper presents a computationally-efficient methodology for multi-objective optimization of antenna structures. In our approach, the set of designs representing the best possible trade-offs between conflicting objectives is obtained by moving along the Pareto front and identifying the subsequent Pareto-optimal solutions using surrogate-based optimization techniques. For the sake of computational...
Expedited multi-objective design optimization of compact microwave/RF circuits is presented. Our approach utilizes variable-fidelity electromagnetic simulations, response surface approximations (RSAs) and design space reduction. The optimization process is conducted by means of a multi-objective evolutionary algorithm applied to the fast RSA model of the structure at hand. Selected Pareto-optimal...
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...
Multi-objective optimization of a quasi-isotropic dielectric resonator antenna (DRA) is presented. Utilization of variable-fidelity electromagnetic (EM) DRA models, response surface approximations, and response correction techniques, allows us to obtain—at a low computational cost—a set of alternative antenna designs representing the best possible trade-offs between three conflicting objectives: antenna...
In this paper, fast design optimization of an ultra-wideband antenna is presented. Our design approach exploits variable-fidelity electromagnetic (EM) simulations and response correction techniques to simultaneously adjust all geometry parameters of the antenna structure at a low computational cost. As a design case, a coplanar waveguide-fed UWB monopole antenna is optimized for 3.1 GHz to 18.5 GHz...
In this work, a structure of a compact ultra-wideband (UWB) monopole antenna implementing an upper WLAN band-notch, as well as its expedited design optimization procedure, are described. The band-notch is realized using meander-shaped slots in the radiation patch. For the sake of computational efficiency, the design procedure exploits variable-fidelity electromagnetic (EM) simulations as well as adjustment...
The paper presents a technique for fast design optimization of compact microwave structures using multi-fidelity electromagnetic (EM) simulations. In our approach, sequential optimization of EM models of increasing fidelity is supplemented by a design refinement step exploiting fast response surface approximation model and space mapping. The technique is demonstrated by the design of a rat-race coupler.
A technique for fast multi-objective design optimization of antenna structures is presented. Our approach exploits variable-fidelity electromagnetic (EM) simulations, auxiliary co-kriging surrogate models, and design space reduction aimed at reducing the computational effort related to EM data acquisition necessary for surrogate model construction. The proposed technique is illustrated through the...
Low-cost optimization of microwave filters using adjoint sensitivities is presented. In our approach, a set of electromagnetic (EM)-simulated models of increasing fidelities is sequentially optimized using a trust-region-based algorithm. Computational efficiency is obtained by executing the major search steps at the coarse-discretization EM simulation level. The technique is demonstrated using the...
In this study, the authors discuss a robust and efficient technique for rapid design of compact couplers. The approach exploits two-level space mapping (SM) correction of an equivalent circuit model of the coupler structure under design. The first SM layer (local correction) is utilised to ensure good matching between the equivalent circuit and the electromagnetic model at the component level. Subsequent...
A methodology for fast design optimization of photonic couplers is discussed. Our approach exploits variable-fidelity EM simulations and adaptively-adjusted design specification (AADS) technique for accommodating misalignment between the low- and high-fidelity coupler model. As demonstrated using an example of a 195 THz coupler, an optimum design can be obtained at the cost corresponding to only about...
In this paper, a methodology for fast multi-objective design optimization of compact microwave circuits is presented. Our approach exploits an equivalent circuit model of the structure under consideration, corrected through implicit and frequency space mapping, then optimized by a multi-objective evolutionary algorithm. The correction/optimization of the surrogate is iterated by design space confinement...
This work addresses simulation-driven design optimization of compact microwave couplers that explicitly aims at circuit footprint area reduction. The penalty function approach allows us to minimize the area of the circuit while ensuring a proper power division between the output ports and providing a sufficient bandwidth with respect to return loss and isolation around the operating frequency. Computational...
In this work, a simple yet reliable technique for fast multi-objective design optimization of miniaturized microwave structures is discussed. The proposed methodology is based on point-by-point identification of a Pareto-optimal set of designs representing the best possible trade-offs between conflicting objectives such as electrical performance parameters as well as the size of the structure of interest...
In this paper, computationally efficient multi-objective optimization of antenna structures is discussed. As a design case, we consider a multi-parameter planar Yagi-Uda antenna structure, featuring a driven element, three directors, and a feeding structure. Direct optimization of the high-fidelity electromagnetic (EM) antenna model is prohibitive in computational terms. Instead, our design methodology...
Design and optimization of trawl-doors are key factors in minimizing the fuel consumption of fishing vessels. This paper discusses optimization of the trawl-door shapes using high-fidelity 3D computational fluid dynamic (CFD) models. The accurate 3D CFD models are computationally expensive and, therefore, the direct use of traditional optimization algorithms, which often require a large number of...
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