dc.contributor | Mendonça, Laércio Martins de | |
dc.contributor | | |
dc.contributor | http://lattes.cnpq.br/2173054084018191 | |
dc.contributor | | |
dc.contributor | http://lattes.cnpq.br/1853488415531363 | |
dc.contributor | Oliveira, João Bosco Lucena de | |
dc.contributor | | |
dc.contributor | http://lattes.cnpq.br/1360004695124740 | |
dc.contributor | D'assunção, Adaildo Gomes | |
dc.contributor | | |
dc.contributor | Gomes Neto, Alfrêdo | |
dc.contributor | | |
dc.contributor | http://lattes.cnpq.br/1403715441701958 | |
dc.contributor | Melo, Marcos Tavares de | |
dc.contributor | | |
dc.contributor | http://lattes.cnpq.br/4933635747860906 | |
dc.creator | Martins, Joêmia Leilane Gomes de Medeiros | |
dc.date.accessioned | 2014-01-17 | |
dc.date.accessioned | 2014-12-17T14:55:13Z | |
dc.date.accessioned | 2022-10-05T23:07:48Z | |
dc.date.available | 2014-01-17 | |
dc.date.available | 2014-12-17T14:55:13Z | |
dc.date.available | 2022-10-05T23:07:48Z | |
dc.date.created | 2014-01-17 | |
dc.date.created | 2014-12-17T14:55:13Z | |
dc.date.issued | 2013-06-07 | |
dc.identifier | MARTINS, Joêmia Leilane Gomes de Medeiros. Análise de antenas utilizando substrato
cerâmico, zpt, produzido por síntese auto
propagante para aplicações em sistemas
de micro-ondas. 2013. 107 f. Tese (Doutorado em Automação e Sistemas; Engenharia de Computação; Telecomunicações) - Universidade Federal do Rio Grande do Norte, Natal, 2013. | |
dc.identifier | https://repositorio.ufrn.br/jspui/handle/123456789/15230 | |
dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/3947553 | |
dc.description.abstract | Ceramic substrates have been investigated by researchers around the world and
has achieved a high interest in the scientific community, because they had high
dielectric constants and excellent performance in the structures employed.
Such ceramics result in miniaturized structures with dimensions well reduced and high
radiation efficiency.
In this work, we have used a new ceramic material called lead zinc titanate in the
form of Zn0,8Pb0,2TiO3, capable of being used as a dielectric substrate in the construction
of various structures of antennas.
The method used in constructing the ceramic combustion synthesis was Self-
Sustained High Temperature (SHS - "Self-Propagating High-Temperature Synthesis")
which is defined as a process that uses highly exothermic reactions to produce various
materials. Once initiated the reaction area in the reaction mixture, the heat generated is
sufficient to become self-sustaining combustion in the form of a wave that propagates
converting the reaction mixture into the product of interest.
Were analyzed aspects of the formation of the composite Zn0,8Pb0,2TiO3 by SHS
powders and characterized. The analysis consisted of determining the parameters of the
reaction for the formation of the composite, as the ignition temperature and reaction
mechanisms.
The production of composite Zn0,8Pb0,2TiO3 by SHS performed in the laboratory,
was the result of a total control of combustion temperature and after obtaining the
powder began the development of ceramics. The product was obtained in the form of
regular, alternating layers of porous ceramics and was obtained by uniaxial pressing.
10
The product was characterized by analysis of dilatometry, X-ray diffraction
analysis and scanning electron microscopy.
One of the contributions typically defined in this work is the development of a
new dielectric material, nevertheless presented previously in the literature. Therefore,
the structures of the antennas presented in this work consisted of new dielectric
ceramics based Zn0,8Pb0,2TiO3 usually used as dielectric substrate. The materials
produced were characterized in the microwave range. These are dielectrics with high
relative permittivity and low loss tangent. The Ansoft HFSS, commercial program
employee, using the finite element method, and was used for analysis of antennas
studied in this work | |
dc.publisher | Universidade Federal do Rio Grande do Norte | |
dc.publisher | BR | |
dc.publisher | UFRN | |
dc.publisher | Programa de Pós-Graduação em Engenharia Elétrica | |
dc.publisher | Automação e Sistemas; Engenharia de Computação; Telecomunicações | |
dc.rights | Acesso Aberto | |
dc.subject | Antenas ressoadoras dielétricas. DRA. Cerâmicas. Titanato de zinco chumbo. ZPT. Combustão. HFSS. Micro-ondas | |
dc.subject | Dielectric resonator antennas. DRA. Ceramics. Lead zinc titanate. ZPT. Combustion. HFSS. Microwaves | |
dc.title | Análise de antenas utilizando substrato
cerâmico, zpt, produzido por síntese auto
propagante para aplicações em sistemas
de micro-ondas | |
dc.type | doctoralThesis | |