This standard gives specifications for rectangular waveguide interfaces. This standard considers the tolerances of the waveguide interface dimensions and the effect these have on the electrical properties (in terms of return loss) of the waveguide.
IEEE 1785.2-2016
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IEEE Standard for Rectangular Metallic Waveguides and Their Interfaces for Frequencies of 110 GHz and Above¿¿¿Part 2: Waveguide Interfaces