%0 Journal Article 
%A Gómez Díaz, Juan Sebastián
%A Martínez Mendoza, Mónica
%A Pérez Soler, Francisco J.
%A Álvarez Melcón , Alejandro
%T An interpolated spatial images method for the analysis of multilayered  shielded microwave circuits
%D 2008
%@ 0895-2477
%U http://hdl.handle.net/10317/1594
%X In this paper, an efficient interpolation method is presented in order to compute the Green’s function
associated to electrical sources, when they are placed inside cylindrical cavities. The interpolation scheme
is formulated in the frame of the spatial images technique recently developed. The original idea was to
calculate, for every location of a point electric source, the complex values of the electric dipole and
charge images, placed outside the cavity, to impose the appropriate boundary conditions for the
potentials. In order to considerably reduce the computational cost of the original technique, a simple
interpolation method is proposed to obtain the complex values of the images for any source location. To
do that, a rectangular spatial subdivision inside the cavity is proposed. Each new sub-region is controlled
by means of the exact images values obtained when the source is placed at the four corners of the region.
The key idea is to use a bilinear interpolation to obtain the images complex values when the source is
located anywhere inside this sub-region. The interpolated images provide the Green’s functions of the
new source positions fast, and with high accuracy. This new approach can be directly applied to analyze
printed planar filters. Two examples with CPU time comparisons are provided, showing the high
accuracy and computational gain achieved with the technique just derived.
%K Teoría de la Señal y las Comunicaciones
%K Funciones de Green
%K Métodos de momentos
%K Circuitos multicapa
%K Método de interpolación
%K Green's functions
%K Multilayered circuits
%K Interpolation method
%K Method of Moments (MOM)
%~ GOEDOC, SUB GOETTINGEN