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Space mapping technology has been one of the first and most widely used physics-based surrogate-assisted approaches to rapid design optimization of expensive EM-simulation models in microwave engineering. When used with care and experience, it offers computational efficiency that is unmatched by conventional numerical optimization techniques. Numerous variations of space mapping have been proposed...
Surrogate-assisted techniques enable considerable reduction of the computational cost of EM-driven design optimization processes. Space mapping (SM) is still the most popular method of this kind. Implicit SM (ISM) is particularly attractive because it does not alter the domain of the underlying coarse model and is easy to implement. Yet, ISM is difficult to apply if an equivalent circuit coarse model...
Availability of fast yet reliable replacement models (also referred to as surrogates) is essential to reduce the computational cost of antenna design process. Unfortunately, conventional approximation (or data-driven) modeling is not well suited for modeling of highly nonlinear responses of antenna structures, especially for larger number of geometry parameters. The latter is due to the so-called...
In this paper, an optimization-based procedure for performance comparison of alternative compact UWB antenna topologies is discussed. Our approach allows for fast assessment of compact antenna performance by identifying the best possible trade-offs between the antenna size and its reflection responses. Analysis of such Pareto-optimal designs obtained for various antenna topologies allows for their...
In this paper, an algorithmic framework for cost-efficient design optimization of miniaturized impedance matching transformers has been presented. Our approach exploits a bottom-up design that involves translating the overall design specifications for the circuit at hand to its elementary building blocks (here, compact microstrip resonant cells, CMRCs), as well as fast surrogate-assisted optimization...
Cost efficient design optimization of microwave structures requires availability of fast yet reliable replacement models so that multiple evaluations of the structure at hand can be executed in reasonable timeframe. Direct utilization of full-wave electromagnetic (EM) simulations is often prohibitive. On the other hand, accurate data-driven modeling normally requires a very large number of training...
A computationally efficient technique for design optimization of UWB antennas has been presented. Our approach adopts feature-based optimization (FBO) concept where the computational speedup is achieved by reformulating the design specifications in terms of suitably defined response features. Because the dependence of the feature point coordinates on geometry parameters of the antenna is much less...
We review the implicit space mapping approach to engineering modeling and optimization. We describe space mapping and implicit space mapping concepts, outline recent advances, and discuss the relationship between implicit space mapping and other types of space mapping techniques. Recent applications and implementation are also discussed.
This work presents an accurate surrogate model of a planar inductor realized in a 65-nm CMOS technology. The main components of our modeling approach include coarse-discretization electromagnetic simulations, kriging interpolation, and space mapping. The surrogate model constructed this way is accurate over a broad frequency range and, as showcased by our examples, can be used to perform reliable...
A fast optimization procedure for EM-driven design of narrow-band antennas is presented. Our approach exploits local approximation models of the antenna response, based on a set of suitably selected characteristic features rather than the entire responses (as functions of frequency). The optimization process is embedded in the trust-region framework for safeguarding convergence. The proposed technique...
Design optimization of wideband antennas is normally performed using repetitive electromagnetic (EM) simulations, which is necessary because simple theoretical models (if available) are not sufficiently accurate. As high-fidelity EM evaluation is computationally expensive, the adjustment of the geometry and/or material parameters of the antenna under consideration is a time consuming process. In this...
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