Waveguide & Flange Designations

This reference is about rectangular electromagnetic waveguides at millimeter wave / THz frequencies. The table below presents commonly used rectangular waveguide and flange designations. Note that above 75 GHz new waveguide designations have been proposed by IEEE in order to extend standards to 1.1 THz.

^-1 EIA: Electronic Industries Alliance
^-2 RCSC: Radio Components Standardization Committee
^-3 IEEE: new standard
^-4 Above about 100 GHz there are often incompatibilites between flanges produced by a variety of companies. This has arisen because the MIL STD flanges have insufficient precision to achieve good performance at shorter wavelengths. A series of ad hoc adjustments have been made by manufacturers in an effort to improve performance, however this can lead to interconnection issues. VivaTech recommends that the customer always specifies the required flange dimensions including the dowel holes and pin diameter when ordering components > 100 GHz.