The invention relates to waveguides. A window 10 for a waveguide 11 consists of an assembly of ceramic blocks arranged in parallel with each other and brazed together, together with METALLIZATION LAYER BETWEEN EACH PAIR OF ADJACENT BLOCKS. APPROPRIATE CHOICE OF DIMENSIONS AND NUMBER OF INDIVIDUAL BLOCKS ALLOWS A WIDEBAND GUIDE WINDOW WINDOW, FREE OF MODES, ASSOCIATED WITH ADAPTATION FINGERS 20 INSTALLED NEAR WINDOW SURFACES. / P / p / p P APPLICATIONS TO ELECTRONIC HYPERFREQUENCY TUBES. / P
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