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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...
In this paper, we demonstrate the importance of precise reflection response control of enhanced-bandwidth antennas by means of automated simulation-driven optimization. In particular, a proper adjustment of antenna dimensions may lead to considerable broadening of the bandwidth even for small topological modifications of the structure. Computational efficiency of the design process is achieved by...
A novel approach to improve axial ratio (AR) and axial ratio bandwidth (ARB) of circular polarized (CP) dielectric resonator antennas (DRA) excited with dual-point feeds is presented. It is applicable to different CP DRA cross sections excited though two inputs with a 90-degree angular separation. First, excitation of the DRA ports that substantially improves AR in the broadside direction at the CP...
In the paper, a novel topology of a miniaturized wideband dual-band rat-race coupler has been presented. Small size of the circuit has been obtained by meandering transmission lines of the conventional circuit. At the same time, the number of independent geometry parameters has been increased in order to secure sufficient circuit flexibility in the context of its design optimization for dual-band...
In this letter, a surrogate-assisted optimization procedure for fast design of compact patch antennas with enhanced bandwidth is presented. The procedure aims at addressing a fundamental challenge of the design of antenna structures with complex topologies, which is simultaneous adjustment of numerous geometry parameters. The latter is necessary in order to find a truly optimum design and cannot be...
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...
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