A class of lightweight spherical-axicon dielectric lenses for high gain wideband antennas
| Autor: | Orlandino Testa, Renato Cicchetti, Antonio Faraone, Valentina Cicchetti |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Permittivity
Materials science General Computer Science Physics::Optics Dielectric Astrophysics::Cosmology and Extragalactic Astrophysics law.invention Axicon lenses traveling-wave antennas Narrowband Optics law Vivaldi antenna antennas Benchmark testing dielectric resonator antennas (DRA) dielectrics high gain wideband antenna permittivity petal-shaped dielectric lens spherical-axicon dielectric lens stacked-disk dielectric lens Vivaldi antennas Wideband wideband dielectric lens General Materials Science business.industry General Engineering TK1-9971 Lens (optics) Azimuth Optical axis Electrical engineering. Electronics. Nuclear engineering business |
| Zdroj: | IEEE Access, Vol 9, Pp 151873-151887 (2021) |
| Popis: | A class of lightweight spherical-axicon-like dielectric lenses suitable for enhancing broadband antennas performances is presented. The proposed lenses, sized according to a reference massive lens, are formed by thin dielectric sheets spaced equiangularly on the azimuth plane (petal-shaped lens), or regularly orthogonally arranged along the lens axis (disks-shaped lens), thus yielding construction simplicity and significant weight reduction. While petal-shaped dielectric lenses are shown to yield mild gain increase, lenses made by thin dielectric disks, orthogonally periodically arranged along the lens optical axis, offer performances much closer to those achieved by comparable massive refractive spherical-axicon dielectric lenses. The time-domain and the focusing characteristics of the proposed lenses are investigated. Then, a Floquet’s mode-based model is proposed to describe the stop-band characteristics of stacked-disk lenses, illustrating the mechanism underpinning their sudden performance degradation observed at the stop-band onset frequency. Full-wave analyses, based on a locally conformal finite integration technique (FIT), implemented in CST Studio Suite™ and validated by measurements or highly accurate FEM simulations, illustrate the excellent characteristics of the proposed lenses to operate with narrowband as well as ultra-wideband (UWB) waveforms. |
| Databáze: | OpenAIRE |
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