Skinner, J; Gruber, M; Eichstadt, S; Appleby, R; Ridler, N M (2024) Uncertainty propagation for microwave scattering parameter measurements subject to time-domain and time-gating transformations. Measurement, 235. 114891

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Abstract

Analysis of the scattering (S-)parameters of devices and materials often involves the inspection of a particular interface or feature. Time-gating functions offered by vector network analysers have routinely been used to gate S-parameters in the time-domain to separate the device or material interface from other physical features of the network. To date, explicit uncertainty propagation through this process has not been demonstrated. PyDynamic, a Python software package, has been developed to explicitly propagate uncertainty between domains (i.e., frequency and time) and through the gating process. This paper presents the application of PyDynamic to S-parameter measurements of a coaxial device, namely a Beatty line, where the analysis presents results in the transformed time-domain and time-gated frequency-domain with uncertainties. In this demonstration, following time-gating of a Beatty line impedance discontinuity, the time-gated and transformed reflection S-parameters show a reduction in uncertainty from up to approximately 0.0025 U linear magnitude and up to 5 degrees in phase to less than 0.0005 U linear magnitude and 0.2 degrees in phase.

Item Type:	Article
Keywords:	time-domain; fourier transform; S-parameters; vector network analyser
Subjects:	Electromagnetics > RF and Microwave
Divisions:	Electromagnetic & Electrochemical Technologies
Identification number/DOI:	10.1016/j.measurement.2024.114891
Last Modified:	17 Sep 2024 09:43
URI:	http://eprintspublications.npl.co.uk/id/eprint/10020

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