Official guidelines in force are based on assumptions that have been demon-strated failures and therefore different mathematical ap-proaches have been proposed. The un-certainty expression in vector network analysis, and in par-ticular in the measurement of scattering matrix elements of multiport networks, is the subject of present active de-velopments in microwave field. INTRODUCTION Any measurement is as good as its uncertainty. Results of the comparison give consistency of the uncertainty analyses performed by the software packages, which can be therefore considered equivalent and mutually validated. These have been generated by real measurements on passive standards with a commercial vector network analyzer. We organized a comparison by performing, with both packages, analyses of the very same datasets. Both packages claim to perform uncertainty anal-yses fully compliant to the Guide of expression of uncertainty in measurement, but following completely different approaches. ![]() ![]() In this paper we compare the result of analysis performed by two packages, VNA Tools II and Multiport Measurement Software version 4 (MMS4). Recently, two software packages have been acquired at INRIM, which allow to per-form this task in a metrological framework. ![]() The expression of uncertainty of scattering parameter measurements in vector network analysis is an active research subject, since no full consensus about proper algorithms for such expression has been reached so far.
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