D’Assunção, Adaildo GomesPaiva, Samuel Belarmino de2024-03-082024-03-082023-05-23PAIVA, Samuel Belarmino de. Simulação e projeto de antenas MIMO para aplicações nas tecnologias UWB, 5G e em smartphones / Samuel Belarmino de Paiva. 2023. 94 f. Orientação: Prof. Dr. Adaildo Gomes D'Assunção. Coorientação: Prof. Dr. Valdemir Praxedes da Silva Neto.Tese (doutorado) - Universidade Federal do Rio Grande do Norte, Centro de Tecnologia, Programa de Pós-Graduação em Engenharia Elétrica e de Computação, Natal, RN, 2023.https://repositorio.ufrn.br/handle/123456789/57836This work presents three MIMO (multiple-input multiple-output) antennas for applications in modern wireless communication systems. The first proposed MIMO antenna has compact dimensions, high isolation between ports and can be used for wireless local area network (WLAN) applications; the second proposed MIMO antenna is a miniaturized MIMO antenna, with high isolation between the ports and which can be used in ultra-wideband (UWB) applications; the proposed third MIMO antenna can be used for smartphone applications and covers the WLAN and 5G bands. Among the advantages that 5G offers, we can highlight ultra-fast speeds, low latency, large channel capacity, high spectral efficiency and massive connection density. Then, MIMO antennas have been extensively studied for applications in this technology, because they can considerably increase the data rate and the channel capacity, due to the channel capacity being proportional to the number of antennas used in transmission and reception, as well they can also improve the link reliability of wireless communications systems through multi-path data transmission and reception. The proposed MIMO antennas were designed using ANSYS HFSS software for numerical characterization, and the prototypes were manufactured with FR-4 dielectric and measured, showing good agreement between simulated and measured results. A key performance parameter of MIMO antennas, the envelope correlation coefficient (ECC), is analyzed and presents good results for the three proposed MIMO antennas. Furthermore, for the proposed antenna for smartphone applications, the effects caused by the user's hands are investigated, which is an extremely important performance parameterAcesso AbertoAntena MIMO5GWLANisolaçãosmartphone.doctoralThesisCNPQ::CIENCIAS EXATAS E DA TERRA