Near-Field Focusing Multibeam Geodesic Lens Antenna for Stable Aggregate Gain in Far-Field

Autor: Omar Orgeira, German Leon, Oscar Quevedo-Teruel, Nelson Jorge Gonçalves Fonseca, Pedro Mongelos García
Rok vydání: 2022
Předmět:
Zdroj: RUO. Repositorio Institucional de la Universidad de Oviedo
instname
ISSN: 1558-2221
0018-926X
DOI: 10.1109/tap.2021.3139093
Popis: The millimeter-wave band is a very attractive frequency band for the new generations of mobile cellular networks, i.e. 5G and 6G, due to its potential to support extremely high data rate transmissions. Innovative antenna solutions are needed to relieve the higher free space attenuation at these frequencies. Here, we propose a multibeam antenna based on a geodesic lens with stable aggregate gain characteristics in far-field. An analytical model based on the physical path of the rays inside the lens is applied to achieve the field distribution in the aperture of the lens. This method is used to find the profile of a near-field focusing lens with a widened beam in the far-field. As a proofof- concept, a seven-beam antenna has been designed. Thanks to the rotational symmetry of the geodesic lens, the antenna beams present similar characteristics over an extended sectorial coverage. The lens antenna has been manufactured and its nearfield focusing features were validated. The prototype has been assessed also in the far-field with a good agreement between model, simulations and measurements. The main novelty of this prototype is to achieve a multiple beam coverage within ±67◦ in the H-plane and ±20◦ in the E-plane, with a gain roll-off smaller than 2 dB at 30 GHz and smaller than 3 dB at 35 GHz. These results validate the stable aggregate gain characteristics in far-field of the proposed solution.
This work has been supported in part by the Spanish Ministry of Science and Innovation and the Spanish Research Agency, under projects ARTEINE (TEC2017-86619-R) and ENHANCE-5G (PID2020-114172RB-C21 / AEI /10.13039/501100011033) and Consejería de Empleo, Industria y Turismo under project GRUPIN-IDI-2018-000191; and in part by the VR Project 2019-03933 under call ”Research project grant within natural and engineering sciences”. The work of O. Quevedo-Teruel was partially sponsored by the Office of Naval Research (ONR), under grant number N62909-20-1-2040. The views and conclusions contained herein are those of the authors only and should not be interpreted as representing those of ONR, the U.S. Navy or the U.S. Government.
Databáze: OpenAIRE
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