In this paper, a practical implementation of the spatialimages technique for the analysis of shielded multilayered printedcircuits inside convex cavities is proposed. A new method is introducedin order to automatically locate the images surrounding thestructure in order to impose the appropriate boundary conditionsfor the potentials. The boundary conditions are imposed at discretepoints along the cavity wall and, therefore, the technique proposedis an approximation to the exact cavity modeling. Furthermore,for the analysis of electrically long cavities, the use of severalrings of images surrounding the entire cavity at different heightsis employed. Using the special features of the formulation, a newmethod of moments implementation combined with the spatial imagestechnique is proposed in order to efficiently analyze practicalmultilayered printed filters, considerably reducing the computationalcost. Several examples with CPU time comparisons are provided,demonstrating the accuracy and efficiency of the new technique.A novel transversal filter in a trapezium-shaped cavity isdesigned, manufactured, and tested for the first time using the spatialimages technique.
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