Status Report on International Millimeter Waveguide Flange Standards (Correspondence)

A variety of approaches to the design of flanges for millimeter waveguide use coupled with the research nature of the work in this field has made standardization a difficult rask. Shortly after World War II, cover flange designs similar to the UG 385/U shown in Fig. 1 were designed (U. S. Army Air Force at Watson Laboratories). This flange design was intended to provide intimate contact across the important broadwalls of the waveguide and precise alignment of the interior sections of the waveguide by the alignment pins. Also, by means of an "O" ring groove provided around the round section, pressurization of these flanges is possible. Thus, with an asexual flange design, the problem of male or female flanges was eliminated and it appeared that a universal design was at hand.