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An optimization-based approach to size reduction of hybrid microwave couplers is proposed. Our technique allows for selection of the most appropriate compact cell (as an elementary building block of a miniaturized coupler) that ensures minimum footprint area of the entire circuit. The selection process is coupled with an explicit coupler size reduction realized by direct gradient-based optimization...
In this work, we demonstrate accelerated multi-objective optimization of integrated inductors by means of Pareto front exploration. The objectives of interest include minimization of the component area, maximization of the quality factor, as well as maintaining required inductance value at a given operating frequency. A set of Pareto-optimal designs is found by moving along the Pareto front using...
This work addresses a problem of multi-objective design optimization of a computationally expensive compact branch-line coupler. Circuit miniaturization is achieved here primarily by using intricate slow-wave structures instead of conventional transmission lines. The presented approach exploits a point-by-point Pareto set exploration with consecutive trade-off designs found by applying adjusted design...
This work addresses the problem of simultaneous determination of circuit topology and geometry parameter values of recurrent slow-wave structures. Here, the considered slow-wave structures are specifically meant for use as building blocks of two-section branch-line couplers, whose size and bandwidth depend on the aforementioned parameters. The proposed design strategy exploits data-driven models of...
In this paper, multi-objective design of integrated spiral inductors is investigated. The method aims at finding the best possible trade-offs between inductor size and its quality factor. We adopt a penalty function approach to achieve a required inductance at a given operating frequency. The design process exploits a Pareto front exploration technique with trust-region-embedded gradient search as...
In this paper, we present a methodology for expedited hierarchical simulation-driven design of miniaturized multi-section branch-line couplers (BLCs). The design process starts from optimization of elementary cells of a slow-wave structure, followed by a fast tuning of their cascade as well as the tuning of the entire coupler. The last two stages exploit surrogate-assisted optimization with the underlying...
A low-cost technique for simulation-driven design optimization of compact branch-line couplers (BLCs) is presented. In the first stage, the coupler cells are individually optimized using a pattern search algorithm. In the second stage the entire coupler structure undergoes a fast tuning exploiting fast surrogate model, constructed from cascaded local response surface approximations (RSAs) of the cells...
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