Programa de Pós-Graduação em Engenharia Elétrica e de Computação
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Master Thesis Análise espectral de reflectarrays com substrato de duas camadas dielétricas anisotrópicas uniaxiais(Universidade Federal do Rio Grande do Norte, 2006-06-12) Souza, Adriano Gouveia de; D'assunção, Adaildo Gomes; ; ; http://lattes.cnpq.br/9187176142584249; Oliveira, Antônio Jerônimo Belfort de; ; http://lattes.cnpq.br/2846838293878451; Sousa, Fernando Rangel de; ; http://lattes.cnpq.br/9092018794878372; Silva, Sandro Gonçalves da; ; http://lattes.cnpq.br/6122570451445215Recently, an amazing development has been observed in telecommunication systems. Two good examples of this development are observed in mobile communication and aerospace systems. This impressive development is related to the increasing need for receiving and transmitting communication signals. Particularly, this development has required the study of new antennas and filters. This work presents a fullwave analysis of reflectarrays. The considered structures are composed by arrays of rectangular conducting patches printed on multilayer dieletric substrates, that are mounted on a ground plane. The analysis is developed in the spectral domain, using an equivalent transmission line method in combination with Galerkin method. Results for the reflection coefficient of these structures are presented and compared to those available in the literature. A good agreement was observed. Particularly, the developed analysis uses the transmission lines theory in combination with the incident potentials and the field continuity equations, at the structures interfaces, for obtaining the scattered field components expressions as function of the patch surface currents and of the incident field. Galerkin method is used to determine the unknown coefficients in the boundary value problem. Curves for the reflection coefficient of several reflectarray geometries are presented as function of frequency and of the structural parametersMaster Thesis Análise espectral de reflectarrays com substratos de duas camadas dielétricas anisotrópicas uniaxiais(Universidade Federal do Rio Grande do Norte, 2006-06-12) Souza, Adriano Gouveia de; D'assunção, Adaildo Gomes; ; ; http://lattes.cnpq.br/9187176142584249; Oliveira, Antônio Jerônimo Belfort de; ; http://lattes.cnpq.br/2846838293878451; Silva, Sandro Gonçalves da; ; http://lattes.cnpq.br/6122570451445215; Sousa, Fernando Rangel de; ; http://lattes.cnpq.br/9092018794878372Recently, an amazing development has been observed in telecommunication systems. Two good examples of this development are observed in mobile communication and aerospace systems. This impressive development is related to the increasing need for receiving and transmitting communication signals. Particularly, this development has required the study of new antennas and filters. This work presents a fullwave analysis of reflectarrays. The considered structures are composed by arrays of rectangular conducting patches printed on multilayer dieletric substrates, that are mounted on a ground plane. The analysis is developed in the spectral domain, using an equivalent transmission line method in combination with Galerkin method. Results for the reflection coefficient of these structures are presented and compared to those available in the literature. A good agreement was observed. Particularly, the developed analysis uses the transmission lines theory in combination with the incident potentials and the field continuity equations, at the structures interfaces, for obtaining the scattered field components expressions as function of the patch surface currents and of the incident field. Galerkin method is used to determine the unknown coefficients in the boundary value problem. Curves for the reflection coefficient of several reflectarray geometries are presented as function of frequency and of the structural parameters