  The resonant transmission of two near-field coupled, cascaded band-pass
filters, based on metallic stripe or patch gratings, is analysed. The response,
in terms both of maximum efficiency and light rejection out of the resonance,
overpasses the simple convolution of the responses of two isolated filters,
while keeping good angular tolerance. Illustrations are given in the infrared
range where sizing and technological integration of such compact structures are
particularly relevant for detection applications.
