MICROWAVE WAVEGUIDE WINDOW HAVING THE SAME CUTOFF FREQUENCY AS ADJOINING WAVEGUIDE SECTION FOR AN INCREASED BANDWIDTH

摘要

A microwave waveguide window is disclosed wherein a dielectric filled window section of waveguide is sealed across a waveguide. The window filled section of waveguide in one embodiment is dimensioned to have approximately the same low frequency cutoff wavelength as that of the adjoining sections of guide, such that the window and that of the adjoining sections of the waveguide support approximately the same waveguide transmission modes. In certain windows of the present invention, a quarter wave matching transformer portion of the dielectric window extends from the window into the adjacent waveguide sections. In other windows of the present invention, one or both adjoining sections of waveguide have a substantially lower height, such as ridged waveguide, than the dielectric filled window section and a short section of transition waveguide is interposed between the window and the adjoining lower height waveguide with the dielectric window member projecting into the transition section of waveguide.