CAMPOS, A. L. P. S.; http://lattes.cnpq.br/1982228057731254; CAMPOS, Antonio Luiz Pereira de Siqueira.
Abstract:
This work presents a theoretical analysis and experimental/numerieal results for
the scattering, characteristics of frequency selective surfaces using perfect conducting
patches. The structures are composed by anisotropic dielectric substrates. The analysis
is developed using the equivalent transmission line approach in combination with the
Galerkin method to determine the transmission and reflection characteristics.
Furthermore, the analysis uses the equivalent transmission line approach which
allows to model the structure as an equivalent circuit and, applying the transmission line
theory, to determine the dyadic Green's function. This function relates the incident
fields with the surface current densities. These fields are determined by the incident
potentials by imposing the field continuity at the dielectric interfaces.
The Galerkin method is used, allowing the numerical determination of the
unknown weighting coefficients and, as a consequence, the current surface densities that
are expanded in terms of the known basis functions multiplied by the weighting
coefficients. The determination of these functions allows the determination of the
scattered fields on the top and bottom of the structure and, consequently, the
determination of the transmission and reflection characteristics of these structures.
In the analysis, three different types of patch geometries are assumed. In
addition, anisotropic dielectric substrates are considered. The anisotropic substrates are
assumed to be uniaxial ones, and the optical axis is considered to be along the direction
perpendicular to the dielectric interfaces.
In this work, numerical and experimental results are presented for the reflection
and transmission characteristics. Comparisons were made with other results presented in
the literature. A good agreement was observed between these results for frequency
selective surfaces using isotropic substrates. Some suggestions are presented for future
works on this subject.