The use of ground planes is proposed inside thespatial images technique in order to calculate the multilayeredshielded Green's functions for rectangular enclosures. The positions of the ground planes are dynamically located, coveringtwo walls of the cavity, as a function of the source position.Spatial mirror images, related to the ground planes, are used toperfectly impose the boundary conditions along these cavity walls.This completely removes the problems associated to the singularbehavior of the source when it is placed close to a wall or acorner, improving numerical stability. In addition, the methodleads to a very efficient computation (about 15 times faster thanthe original approach), due to the reduced number of non-mirrorimages that must be effectively computed. A multi-band filter inhybrid waveguide-microstrip technology is analyzed with the newmethod, showing excellent agreement with measured data.
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