CT - DCO - Departamento de Engenharia de Comunicações
URI Permanente desta comunidadehttps://repositorio.ufrn.br/handle/123456789/29842
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Navegando CT - DCO - Departamento de Engenharia de Comunicações por Autor "Araújo, José Humberto de"
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Artigo Simulation and design of a tuneable ferrite resonator antenna based on nanostructured nickel ferrite material(IET Microwaves, Antennas and Propagation, 2015-11-16) Araújo, José Humberto de; Silva Neto, Valdemir Praxedes; Vasconcelos, Cristhianne de Fátima Linhares de; Albuquerque, Maria Rosa Medeiros Lins de; Delmonte, Maurício Roberto Bomio; D’Assunção, Adaildo GomesA tuneable ferrite resonator antenna (FRA) based on nanostructured nickel ferrite (NiFe 2O4) material is proposed. Magnetic and dielectric characteristics are determined for the NiFe 2 O 4 material such as electrical permittivity, and hysteresis loops. This ferrite material is used as a microwave resonator in the designing and fabrication of a cylindrical FRA. Ansoft high-frequency structure simulator software is used to provide simulated results for the antenna parameters such as resonant frequency, return loss, input impedance, and radiation pattern. A resonant frequency tuning capability with the application of a varied external magnetic bias field is shown. Measurement of the antenna prototype is also carried out and the obtained results are in good agreement with the simulated onesArtigo Simulation and measurement of inset-fed microstrip patch antennas on BiNbO 4 substrates(Wiley, 2010-03-05) Araújo, José Humberto de; Carneiro Filho, Ranilson; Ginani, Marconi Floripe; D'Assunção Júnior, Adaildo Gomes; Martins, R. A.; Mendonça, L. M.; D'Assunção, Adaildo GomesThis work presents an experimental investigation of the properties of microstrip patch antennas on bismuth niobate ceramic substrates. The substrate fabrication process and characterization are described. Several prototypes were built and measured for wireless communication systems. A good agreement was observed between measured and simulated results. The very high electrical permittivity of the ceramic substrate provided a reduction of the antenna dimensions