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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

An?lise neurocomputacional de Antenas de microfita multibanda para sistemas de comunica??o sem fio

Ara?jo, Wellington Candeia de 10 August 2007 (has links)
Made available in DSpace on 2014-12-17T14:55:01Z (GMT). No. of bitstreams: 1 WellingtonCA.pdf: 2479530 bytes, checksum: b3f1a9eeb71d69303b76e476fd5fe393 (MD5) Previous issue date: 2007-08-10 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / This work presents a study of implementation procedures for multiband microstrip patch antennas characterization, using on wireless communication systems. An artificial neural network multilayer perceptron is used to locate the bands of operational frequencies of the antenna for different geometrics configurations. The antenna is projected, simulated and tested in laboratory. The results obtained are compared in order to validate the performance of archetypes that resulted in a good one agreement in metric terms. The neurocomputationals procedures developed can be extended to other electromagnetic structures of wireless communications systems / Esta disserta??o apresenta um estudo dos procedimentos de implementa??o para a caracteriza??o de antenas patch de microfita multibanda empregadas em sistemas de comunica??es sem fio. Uma rede neural artificial do tipo percepton multicamada ? empregada para localizar as bandas de freq??ncias operacionais da antena para diferentes configura??es geom?tricas. A antena ? projetada, simulada e testada em laborat?rio. Os resultados obtidos s?o comparados a fim de validar o desempenho dos prot?tipos que resultou numa boa concord?ncia em termos m?tricos. Os procedimentos neurocomputacionais desenvolvidos podem ser estendidos a outras estruturas eletromagn?ticas de sistemas de comunica??es sem fio

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