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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...
Multi-objective optimization yields indispensable information about the best possible design trade-offs of an antenna structure, yet it is challenging if full-wave electromagnetic (EM) analysis is utilized for performance evaluation. The latter is a necessity for majority of contemporary antennas as it is the only way of achieving acceptable modeling accuracy. In this paper, a procedure for accelerated...
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 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...
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...
In this paper, a problem of dimension scaling of compact microstrip couplers with unequal power split has been addressed. Using a few reference designs optimized at the level of equivalent circuit model as well as a coupler design optimized for equal power split at the level of its electromagnetic (EM) simulation model, an inverse surrogate is constructed that allows us to precisely re-design the...
Implementation of band-notch capability plays an important role in the design of ultra-wideband (UWB) antennas. At the same time, appropriate sizing of antenna geometry parameters in order to precisely allocate the notch at the required frequency as well as to ensure sufficient reflection level is quite challenging and has to be based—for reliability reasons—on full-wave electromagnetic (EM) simulations...
In this paper, a technique for low-cost statistical analysis and yield estimation of compact microwave couplers has been presented. The analysis is executed at the level of a fast surrogate model representing selected characteristic points of the coupler response that are critical to determine satisfaction/violation of the prescribed design specifications. Because of less nonlinear dependence of the...
In this work, we propose a computationally efficient procedure for dimension scaling of antenna structures. The fundamental component of our methodology is an inverse surrogate model that relates geometry parameters of the antenna structure of interest to its operating frequency. The surrogate is constructed using several antenna designs obtained at the level of the coarse-discretization EM simulation...
A methodology for fast design of antenna arrays is presented. Our approach allows for simultaneous control of the radiation pattern as well as reflection coefficients. We exploit an analytical antenna array model that embeds the simulated radiation and reflection responses of individual radiators. To lower the design cost, the analytical model is based on coarse-discretization simulations and subsequent...
A planar (5 by 5) array of microstrip antennas is designed using full-wave electromagnetic (EM) simulation and the surrogate-based optimization (SBO) methodology. The design goals include reduction of the sidelobe levels as well as keeping reflection signals low (better than −10dB) at the array element terminals. Our design approach exploits both low-fidelity EM simulation model of the array used...
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