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Previous issue date: 2016-06-27 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Nos ?ltimos anos, a crescente demanda por novas tecnologias na ?rea de telecomunica??es tem gerado grande aten??o por parte da comunidade cient?fica. Com a evolu??o dos sistemas de micro-ondas, o fen?meno da converg?ncia de servi?os em um ?nico dispositivo e a expans?o nas redes de comunica??es sem fio determinaram a necessidade de desenvolvimento de novas antenas, com baixo custo, dimens?es reduzidas e com caracter?sticas cada vez mais espec?ficas. Neste contexto, as antenas planares de microfita t?m sido amplamente utilizadas pela ind?stria. Em determinados sistemas de comunica??es m?veis, como sistemas de radar, sat?lite e navega??o, a utiliza??o de antenas circularmente polarizadas tem ganhado grande destaque, uma vez que, devido ?s suas caracter?sticas eletromagn?ticas, a polariza??o circular possibilita a redu??o de problemas de desempenho em ambientes sujeitos ?s intemp?ries do clima e possui pouca depend?ncia em rela??o ao alinhamento das antenas de transmiss?o e recep??o. Esta disserta??o tem como base a an?lise e o desenvolvimento de antenas compactas de microfita circularmente polarizadas com alimenta??o ?nica. S?o analisadas v?rias t?cnicas para a obten??o de polariza??o circular e a miniaturiza??o de antenas de microfita. Al?m disso, com base na fundamenta??o te?rica e em an?lise param?trica, s?o apresentadas novas configura??es de antenas para aplica??es em sistemas de comunica??es sem fio. Prot?tipos destas antenas foram constru?dos e medidos para fins de verifica??o, tendo sido observada uma boa concord?ncia entre os resultados simulados e medidos. / Recently, the growing demand for new technologies in telecommunications has generated much attention from the scientific community. The development of RF systems, the phenomenon of convergence services in a single device and the expansion of wireless communications networks have required the development of new antennas, with low cost, small size and increasingly specific properties. In this context, planar microstrip antennas have been widely used by the industry. In certain mobile communication systems such as radar, satellite, and Global Positioning System (GPS), the use of circularly polarized antennas has gained great emphasis, since, due to their electromagnetic characteristics, the circular polarization enables good performance even in environments subject to severe weather conditions and has small dependence on the misalignment of the transmitting and receiving antennas. This dissertation proposal is based on the analysis and development of single feed miniaturized circularly polarized microstrip antennas. Different techniques are investigated to provide microstrip antennas circular polarization and size miniaturization. In addition, based on theoretical and parametric analyses, new antennas configurations are proposed for applications in wireless communication systems. Several prototypes are built and measured for validation purpose. A good agreement is observed between simulation and measurements results.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/22082 |
| Date | 27 June 2016 |
| Creators | Santos, Heric Weverton dos |
| Contributors | 04401565487, Mendon?a, Laercio Martins de, 09064087415, http://lattes.cnpq.br/1853488415531363, D'Assun??o J?nior, Adaildo Gomes, 00980645417, Oliveira, Jos? de Ribamar Silva, 12559520320, http://lattes.cnpq.br/4002176927695547, D'Assun??o, Adaildo Gomes |
| Publisher | 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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