A numerical model for multilayered microstrip phased-array antennas

Multimode Equivalent Networks for the Design and Analysis of Frequency Selective Surfaces

“…For this kind of structure, either the scattering problem is tackled simultaneously at all layers, by solving the corresponding system of coupled integral equations [3], or it is treated separately at each layer by resorting to a modular methodology. The latter approach is computationally convenient, as argued in [4]. Moreover, it can be implemented in a general-purpose software tool that allows analyzing an arbitrary number of layers and is therefore an efficient design instrument.…”

“…A more efficient formulation proposed in [4], [9], [10] allows the computation of the scattering parameters for all incident modes at once.…”

“…An appealing characteristic of these representations is that they can be directly inter-0018-926X/$25.00 © 2007 IEEE preted in terms of physical parameters of the represented structure. For example, in [4] a GSM formulation was presented to analyse a microstrip phased array antenna and, to obtain the antenna input impedance, from the calculated GSM the GAM of the slot/microstrip-line transition was derived. In a recent paper [11], it has been shown that the equivalent admittance matrix of a dipole FSS is a useful tool to investigate the dispersion properties of the surface waves modes, and it can be directly linked to the phase behavior of the reflection coefficient.…”

“…This property becomes explicit in the IEMEN formulation, thanks to the adopted expression of the reduced spectral periodic Green's Function. The solution of a reduced kernel IE was already presented in [4] to derive a GSM representation of slot junctions, but the properties of this kernel were not further investigated.…”