Compact high-gain wideband antenna systems for through-the-wall imaging and wireless communications, featuring 160% fractional bandwidth, are presented. Each radiating system, consisting of two orthogonal Vivaldi antennas forming a cross-shaped configuration so to excite linear (horizontal/vertical) and circular polarization (CP), is equipped with a top-mount spherical-axicon dielectric lens. The optimized shaping of the lens and of the outer edge Vivaldi arms allow achieving gain levels exceeding 15dBi with good front-to-back-ratio. The proposed antenna features a broadside gain diagram with stable radiation pattern and wideband impedance matching in the frequency range between 650 MHz and 6 GHz. CST Microwave Studio®, implementing a full-wave locally conformal finite integration technique (FIT), was employed to design and characterize the antenna and to guide its physical realization. Two-port equivalent circuits were developed to characterize parasitic coupling effects between the Vivaldi antennas ports, while a full-wave analysis allowed characterizing their frequency and time domain behaviors. The numerical results concerning the antennas parameters, illustrating the suitability of the proposed antennas to support narrow and ultra-wideband signal waveforms, are found to be in good agreement with the experimental measurements performed on an antenna prototype.

A compact high-gain wideband lens Vivaldi antenna for wireless communications and through-the-wall imaging / Cicchetti, Renato; Cicchetti, Valentina; Faraone, Antonio; Foged, Lars; Testa, Orlandino. - In: IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION. - ISSN 0018-926X. - 69:6(2021), pp. 3177-3192. [10.1109/TAP.2020.3037777]

A compact high-gain wideband lens Vivaldi antenna for wireless communications and through-the-wall imaging

Cicchetti, Renato
;
Cicchetti, Valentina;Testa, Orlandino
2021

Abstract

Compact high-gain wideband antenna systems for through-the-wall imaging and wireless communications, featuring 160% fractional bandwidth, are presented. Each radiating system, consisting of two orthogonal Vivaldi antennas forming a cross-shaped configuration so to excite linear (horizontal/vertical) and circular polarization (CP), is equipped with a top-mount spherical-axicon dielectric lens. The optimized shaping of the lens and of the outer edge Vivaldi arms allow achieving gain levels exceeding 15dBi with good front-to-back-ratio. The proposed antenna features a broadside gain diagram with stable radiation pattern and wideband impedance matching in the frequency range between 650 MHz and 6 GHz. CST Microwave Studio®, implementing a full-wave locally conformal finite integration technique (FIT), was employed to design and characterize the antenna and to guide its physical realization. Two-port equivalent circuits were developed to characterize parasitic coupling effects between the Vivaldi antennas ports, while a full-wave analysis allowed characterizing their frequency and time domain behaviors. The numerical results concerning the antennas parameters, illustrating the suitability of the proposed antennas to support narrow and ultra-wideband signal waveforms, are found to be in good agreement with the experimental measurements performed on an antenna prototype.
2021
dielectric lens; dual-polarized antennas; polarization diversity; through-the-wall imaging (TWI); two-port equivalent circuit; Vivaldi antennas; spherical-axicon lens; wideband antennas; wireless communications
01 Pubblicazione su rivista::01a Articolo in rivista
A compact high-gain wideband lens Vivaldi antenna for wireless communications and through-the-wall imaging / Cicchetti, Renato; Cicchetti, Valentina; Faraone, Antonio; Foged, Lars; Testa, Orlandino. - In: IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION. - ISSN 0018-926X. - 69:6(2021), pp. 3177-3192. [10.1109/TAP.2020.3037777]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1479066
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