Journal ArticleDOI
Topology Optimization of Planar Antennas for Wideband Near-Field Coupling
TLDR
It is demonstrated that an antenna optimized in this way shows a high sensitivity when used for near-field detection of a phantom with dielectric properties representative of muscle tissue.Abstract:
We present an approach to design from scratch planar microwave antennas for the purpose of ultra-wideband (UWB) near-field sensing. Up to about 120 000 design variables associated with square grids on planar substrates are subject to design, and a numerical optimization algorithm decides, after around 200 iterations, for each edge in the grid whether it should consist of metal or a dielectric. The antenna layouts produced with this approach show UWB impedance matching properties and near-field coupling coefficients that are flat over a much wider frequency range than a standard UWB antenna. The properties of the optimized antennas are successfully cross-verified with a commercial software and, for one of the designs, also validated experimentally. We demonstrate that an antenna optimized in this way shows a high sensitivity when used for near-field detection of a phantom with dielectric properties representative of muscle tissue.read more
Citations
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Journal ArticleDOI
Optimal Composition of Modal Currents for Minimal Quality Factor $Q$
Miloslav Capek,Lukas Jelinek +1 more
TL;DR: In this paper, the authors present a simple procedure to acquire a current approaching the lower bound of quality factor $Q$ for an arbitrarily shaped electrically small radiator made of a perfect conductor.
Journal ArticleDOI
Antenna Modeling Using Variable-Fidelity EM Simulations and Constrained Co-Kriging
TL;DR: A novel modeling approach involving variable-f fidelity EM simulations incorporated into the recently reported nested kriging modeling framework is proposed, which exhibits the predictive power comparable to the model constructed using exclusively high-fidelity data while offering significantly reduced setup cost.
Journal ArticleDOI
Fast Multi-Objective Optimization of Antenna Structures by Means of Data-Driven Surrogates and Dimensionality Reduction
TL;DR: This work proposes a novel surrogate-assisted approach to multi-objective optimization, where the data-driven model is only rendered in a small region spanned by the selected principal components of the extreme Pareto-optimal design set obtained using local search routines.
Journal ArticleDOI
Multilayer Topology Optimization of Wideband SIW-to-Waveguide Transitions
Emadeldeen Hassan,Benedict Scheiner,Fabian Michler,Martin Berggren,Eddie Wadbro,Franz Xaver Rohrl,Stefan Zorn,Robert Weigel,Fabian Lurz +8 more
TL;DR: In this paper, a topology optimization approach to design planar multilayer transitions between substrate integrated waveguides (SIWs) and rectangular waveguide (RWGs) is presented.
Journal ArticleDOI
Fast Design Closure of Compact Microwave Components by Means of Feature-Based Metamodels
TL;DR: This work discusses a surrogate-based algorithm for fast design closure and dimension scaling of miniaturized microwave passives using a small database of previously obtained designs as well as two metamodels, an inverse one employed to yield a high-quality initial design, and the forward surrogate that provides predictions of the system sensitivities.
References
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Journal ArticleDOI
Numerical solution of initial boundary value problems involving maxwell's equations in isotropic media
Abstract: Maxwell's equations are replaced by a set of finite difference equations. It is shown that if one chooses the field points appropriately, the set of finite difference equations is applicable for a boundary condition involving perfectly conducting surfaces. An example is given of the scattering of an electromagnetic pulse by a perfectly conducting cylinder.
Book
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Computational Electrodynamics: The Finite-Difference Time-Domain Method
TL;DR: This paper presents background history of space-grid time-domain techniques for Maxwell's equations scaling to very large problem sizes defense applications dual-use electromagnetics technology, and the proposed three-dimensional Yee algorithm for solving these equations.
Book
Topology Optimization: Theory, Methods, and Applications
Martin P. Bendsøe,Ole Sigmund +1 more
TL;DR: In this article, the authors proposed a topology optimization by distribution of isotropic material for truss structures with anisotropic materials, based on the topology design of truss structure.
Proceedings ArticleDOI
The Vivaldi Aerial
TL;DR: The Vivaldi Aerial is a new member of the class of aperiodic continuously scaled antenna structures and, as such, it has theoretically unlimited instantaneous frequency bandwidth as discussed by the authors, and can be made to conform to a constant gain vs. frequency performance.