Attilio José Giarola

University of Campinas, Conceição de Campinas, São Paulo, Brazil

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Publications (6)2.95 Total impact

  • [show abstract] [hide abstract]
    ABSTRACT: An introduction to a new computer-aided-design (CAD) package (PACMO), particularly useful for graduate courses in microwave devices, is presented. It contains subroutines for the design and analysis of ten microwave devices. The subroutines were developed to give rapid and practical help in obtaining design parameters based on the performance of the devices to be constructed. Although they are based mainly on established classical theories, their development required additional studies due to the complexity of the analyses involved.
    IEEE Transactions on Education 12/1983; · 0.95 Impact Factor
  • Humberto Cesar Chaves Fernandes, Attilio Jose Giarola
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    ABSTRACT: Using an efficient method of analysis the dispersion characteristics in new unilateral fin-line structures have been obtained. It consists of using an equivalent transmission line theory in the spectral domain of the Fourier transform with the moment method. The analysis is general and may be applied to a variety of structures. Numerical results are obtained for unilateral fin lines with one and two dielectric layers located symmetrically or asymmetrically in the E-plane of the waveguide.
    Microwave Conference, 1983. 13th European; 10/1983
  • [show abstract] [hide abstract]
    ABSTRACT: A model with four layered media is developed for the calculation of the radio loss in forests. In this model two lossy dielectric layers placed over a conducting flat earth are used to represent the crown and the trunk of the trees. Dyadic Green's functions in their eigenfunction expansion forms are used to analyze this model, and the electromagnetic fields are obtained from these functions. The theoretical results of the radio loss for vertical and horizontal radiating dipoles and for typical forests agree with the available experimental data. For this comparison the parameters for the layer representing the crown of the trees were estimated.
    Radio Science 01/1983; 18:691-695. · 1.00 Impact Factor
  • [show abstract] [hide abstract]
    ABSTRACT: The propagation of electromagnetic waves in media with various horizontal layers has been analyzed. The electromagnetic fields outside the source region were obtained from the dyadic Green's functions for the case of media with three and four layers and for horizontal and vertical electric dipoles. These results agree with those obtained using Hertz potentials. One of the major results is a generalization of the dyadic Green's functions for solving the problem of media with N horizontal layers.
    Radio Science 01/1982; 17:503-508. · 1.00 Impact Factor
  • Source
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    ABSTRACT: Um novo método de análise de onda completa é usado na determinação da constante dielétrica efetiva e da impedância característica, de estruturas de linhas de fendas generais e arbitrárias. São usados novos procedimentos do método de linha de Transmissão Transversa, que se apresenta como um dos mais diretos e eficientes métodos de análise de estruturas planarem. São apresentados resultados numéricos para a constante dielétrica efetiva e para a impedância característica em função da freqüência, para diferentes espessuras e permissividades dielétricas, e para diferentes larguras da fenda.
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    ABSTRACT: Usando dois eficientes métodos exatos de análises, a constante dielétrica efetiva e a impedância característica de novas estruturas de linhas de laminas unilaterais, bilaterais e trilaterais são obtidas. Os métodos consistem em usar as teorias de Linha de Transmissão Transversa e da Linha de Transmissão Equivalente, no domínio espectral com o método dos momentos. As análises são gerais podendo ser aplicadas a qualquer estrutura planar. Resultados numéricos são apresentados para os parâmetros da dispersão característica de linhas de laminas unilaterais tridielétricas, bilaterais e trilaterais, com os dielétricos localizados simétrico e assimetricamente no plano-E do guia de ondas.