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Previous issue date: 2013-07-26 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico - CNPq / Este trabalho apresenta um estudo da integra??o de filtros e antenas de microfita,
originando dispositivos denominados como filtennas, para aplica??es em sistemas de
comunica??es sem fio. A concep??o destas estruturas surgiu da observa??o
de filtennas baseadas na integra??o entre antenas cornetas e superf?cies seletivas de
frequ?ncia (FSS), usadas na banda X. A op??o por estruturas de linhas de microfita para
o desenvolvimento de uma nova configura??o de filtennas se justifica pela larga
aplica??o dessas linhas de transmiss?o, nas ?ltimas d?cadas, resultando sempre na
fabrica??o de circuitos planares com estruturas leves, de dimens?es reduzidas, de baixo
custo, f?ceis de construir e, principalmente, f?ceis de integrar com outros circuitos de
micro-ondas. Al?m disso, a estrutura de antena considerada para a composi??o
das filtennas consiste de um monopolo planar de microfita com a integra??o de filtros
de microfita na linha de alimenta??o da antena. Em particular, s?o considerados
monopolos el?pticos de microfita (que operam em banda ultralarga, UWB) e filtros de
microfita (em estruturas com se??es associadas em s?rie e/ou acopladas). Al?m disso, o
monopolo de microfita apresenta uma largura de banda adequada e um diagrama de
radia??o omnidirecional, de tal forma que a sua integra??o com filtros de microfita
resulta na redu??o da largura de banda, por?m com pequenas altera??es no diagrama de
radia??o. Os m?todos usados na an?lise dos monopolos, filtros e filtennas foram os dos
elementos finitos e dos momentos, atrav?s da utiliza??o dos softwares comerciais Ansoft
Designer e Ansoft HFSS, respectivamente. Especificamente, s?o analisadas as
caracter?sticas principais das filtennas, tais como: diagrama de radia??o, ganho e largura
de banda. Foram projetadas, constru?das e medidas, diversas estruturas de filtennas, para
fins de valida??o dos resultados simulados. Tamb?m foram utilizadas ferramentas
computacionais (CAD) no processo de constru??o de prot?tipos dos monopolos
planares, dos filtros e das filtennas. Os prot?tipos foram constru?dos sobre substratos de
fibra de vidro (FR4). As medi??es foram realizadas no Laborat?rio de
Telecomunica??es da UFRN. Foram efetuadas compara??es entre resultados simulados
e medidos, sendo observada uma boa concord?ncia nos casos considerados / This paper presents a study of the integration of filters and microstrip antennas, yielding
devices named as filtennas for applications in wireless communications systems. The
design of these structures is given from the observation of filtennas based integration
between horn antennas and frequency selective surfaces (FSS), used in the band X. The
choice of microstrip line structures for the development of a new configuration filtennas
justifies the wide application of these transmission lines, in recent decades, always
resulting in the production of circuit structures with planar light-weight, compact size,
low cost, easy to construct and particularly easy to integrate with other microwave
circuits. In addition, the antenna structure considered for the composition of filtennas
consists of a planar monopole microstrip to microstrip filters integrated in the feed line
of the antenna. In particular, are considered elliptical monopole microstrip (operating in
UWB UWB) microstrip filters and (in structures with associated sections in series and /
or coupled). In addition, the monopole microstrip has a proper bandwidth and omnidirectional
radiation pattern, such that its integration with microstrip filters results in
decreased bandwidth, but with slight changes in the radiation pattern. The methods used
in the analysis of monopoles, and filters were filtennas finite elements and moments by
using commercial software Ansoft Designer and HFSS Ansoft, respectively.
Specifically, we analyze the main characteristics of filtennas, such as radiation pattern,
gain and bandwidth. Were designed, constructed and measures, several structures
filtennas, for validation of the simulated results. Were also used computational tools
(CAD) in the process of building prototypes of planar monopoles, filters and filtennas.
The prototypes were constructed on substrates of glass-fiber (FR4). Measurements were
performed at the Laboratory for Telecommunications UFRN. Comparisons were made
between simulated and measured, and found good agreement in the cases considered
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/19681 |
| Date | 26 July 2013 |
| Creators | Minervino, Diego Ramalho |
| Contributors | 04401565487, http://lattes.cnpq.br/4159638862269940, Mendon?a, La?rcio Martins de, 09064087415, http://lattes.cnpq.br/1853488415531363, D'Assun??o J?nior, Adaildo Gomes, 00980645417, http://lattes.cnpq.br/7359899329008024, Oliveira, Jos? de Ribamar Silva, 12559520320, http://lattes.cnpq.br/4002176927695547, Silva, Paulo Henrique da Fonseca, 98196294700, http://lattes.cnpq.br/0656625630248917, D'Assun??o, Adaildo Gomes |
| Publisher | Universidade Federal do Rio Grande do Norte, PROGRAMA DE P?S-GRADUA??O EM ENGENHARIA EL?TRICA E DE COMPUTA??O, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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