Abstrakt
In this paper, a novel structure of a compact UWB slot antenna and its
design optimization procedure has been presented. In order to achieve a
sufficient number of degrees of freedom necessary to obtain a considerable
size reduction rate, the slot is parameterized using spline curves. All
antenna dimensions are simultaneously adjusted using numerical
optimization procedures. The fundamental bottleneck here is a high cost of
the electromagnetic (EM) simulation model of the structure that includes
(for reliability) an SMA connector. Another problem is a large number of
geometry parameters (nineteen). For the sake of computational efficiency,
the optimization process is therefore performed using variable-fidelity EM
simulations and surrogate-assisted algorithms. The optimization process is
oriented towards explicit reduction of the antenna size and leads to a
compact footprint of 199 mm2 as well as acceptable matching within the
entire UWB band. The simulation results are validated using physical
measurements of the fabricated antenna prototype.
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