A compact high-gain wideband lens Vivaldi antenna for wireless communications and through-the-wall imaging
| Autor: | Renato Cicchetti, Orlandino Testa, Antonio Faraone, Lars J. Foged, Valentina Cicchetti |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Acoustics
Impedance matching 02 engineering and technology through-the-wall imaging (TWI) law.invention Radiation pattern spherical-axicon lens law 0202 electrical engineering electronic engineering information engineering Electrical and Electronic Engineering Wideband dielectric lens dual-polarized antennas polarization diversity two-port equivalent circuit Vivaldi antennas wideband antennas wireless communications Circular polarization Computer Science::Information Theory Physics 020206 networking & telecommunications Lens (optics) Equivalent circuit Antenna (radio) Vivaldi antenna |
| Popis: | 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 as 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 15 dBi 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|