Made available in DSpace on 2014-12-17T14:55:51Z (GMT). No. of bitstreams: 1 GilmaraLRA_DISSERT.pdf: 1784124 bytes, checksum: 3fa88890e9688357a4f14429c6d94ab0 (MD5) Previous issue date: 2011-07-29 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / This work presents the analysis of an antenna of fractal microstrip of Koch with dielectric multilayers and inclinations in the ground plane, whose values of the angles are zero degree (without inclinations), three, seven and twelve degrees. This antenna consists of three dielectric layers arranged vertically on each other, using feeding microstrip line in patch 1, of the first layer, which will feed the remaining patches of the upper layers by electromagnetic coupling. The objective of this work is to analyze the effects caused by increase of the angle of inclination of the ground plane in some antenna parameters such as return loss, resonant frequency, bandwidth and radiation pattern. The presented results demonstrate that with the increase of the inclination angle it is possible to get antennas with characteristics multiband, with bigger bandwidth, and improving the impedance matching for each case analyzed, especially the larger angle / Este trabalho apresenta a an?lise de uma antena de microfita fractal de Koch com multicamadas diel?tricas e inclina??es no plano de terra, cujos valores dos ?ngulos s?o zero grau (sem inclina??es), tr?s, sete e doze graus. Esta antena ? constitu?da por tr?s camadas diel?tricas dispostas verticalmente umas sobre as outras, utilizando alimenta??o por linha de microfita no patch 1, da primeira camada, que ir? alimentar os demais patches das camadas superiores por acoplamento eletromagn?tico. O objetivo deste trabalho ? analisar os efeitos causados pelo aumento do ?ngulo de inclina??o do plano de terra em alguns par?metros da antena, tais como perda de retorno, frequ?ncia de resson?ncia, largura de banda e diagrama de radia??o. Os resultados apresentados demonstram que com o aumento do ?ngulo de inclina??o ? poss?vel obter antenas com caracter?sticas multibanda, com maiores larguras de banda, al?m de melhoramento do casamento de imped?ncias para cada caso analisado, sobretudo os de maior ?ngulo de inclina??o