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Gdańsk University of Technology

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A compact spline-enhanced monopole antenna for broadband/multi-band and beyond UWB applications

In this work, a compact monopole antenna for broadband/multi-band and beyond ultra- wideband (UWB) communication has been proposed. The structure is based on a spline-enhanced radiator with a broadband feed and a modified ground plane. Rigorous design optimization of the radiator has been performed in a two-stage framework where optimization of the structure with respect to electrical performance is followed by explicit miniaturization using a constrained objective function. Two compact radiators characterized by footprints of 404 mm 2 and 322 mm 2 , as well as frequency ranges from 2.8 GHz to 34.9 GHz and from 2.9 GHz to 33.9 GHz have been designed. Except for a relatively narrow frequency range in Ka band (from 34.9 GHz to 37.8 GHz), the larger structure is capable of operating for up to 80 GHz. Owing to a simple topology, small size and broadband operation, the presented antennas are of potential use in mobile terminals dedicated to support various wireless technologies including Internet of Things, WiFi, or UWB-based localization services. The proposed radiators have been benchmarked against other broadband/beyond UWB antennas from the literature. Electrical and field characteristics of the proposed structures have been confirmed through measurements of the fabricated prototypes.

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