An innovative waveguide interface and quarter-wavelength shim for the 220∓325 GHz band

An innovative waveguide flange offers superior alignment based on a concentric mating mechanism consisting of a boss and jack interface. Above 100 GHz, this flange interface improves repeatability and precision of S-parameters measurements by eliminating the mechanical tolerance build-up associated with separate alignment pins. By simplifying the build-up of tolerance to only the boss and jack interface, the alignment improves match, precision, repeatability and residual calibration performance for mm-wave and sub-mm-wave S-parameter measurements. This flange is entirely compatible with the MIL-DTL-3922/67D standard. This paper presents connection repeatability for 220-325 GHz (WR-03 band). This flange is awaiting standardization in the P1785 working group of IEEE.