Comparison of 1.85mm line reflect line and offset short calibration

This paper shows how the S-parameters in 1.85 mm coaxial line systems can be defined in a traceable way. It is found that a very fail-proof verification method is to compare two different and independent calibration techniques. Here a line reflect line method is compared to an offset short calibration. Measurements of a load, which were corrected with both calibrations, showed an agreement which was better than 0.003 in linear S-parameters up to 67 GHz. Key factors for achieving this accuracy are the taking into account of connector effects and the setting of pin gaps to defined values with dielectric rings.