Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-01-26T18:48:32Z No. of bitstreams: 1 DiegoRamalhoMinervino_DISSERT.pdf: 2172898 bytes, checksum: a8bff6e742ddc2345c999d514911b306 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-01-28T20:40:26Z (GMT) No. of bitstreams: 1 DiegoRamalhoMinervino_DISSERT.pdf: 2172898 bytes, checksum: a8bff6e742ddc2345c999d514911b306 (MD5) / Made available in DSpace on 2016-01-28T20:40:26Z (GMT). No. of bitstreams: 1 DiegoRamalhoMinervino_DISSERT.pdf: 2172898 bytes, checksum: a8bff6e742ddc2345c999d514911b306 (MD5) 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