VNA Tools II: S-parameter uncertainty calculation
VNA Tools II: S-parameter uncertainty calculation
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DOI：
10.1109/arftg79.2012.6291183
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发表时间：
2012-06
期刊：
影响因子：
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通讯作者：
M. Wollensack;J. Hoffmann;J. Ruefenacht;M. Zeier
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文献类型：
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作者：
M. Wollensack;J. Hoffmann;J. Ruefenacht;M. Zeier
本文介绍了一种用于计算同轴S参数测量不确定度的软件METAS VNA Tools II。使用了自下而上的概念。因此，通过矢量网络分析仪的校准，基本影响量被传播到被测设备的S参数。METAS UncLib用于不确定性的线性传播。其结果不仅是一个不确定区域，而且是一系列具有相关性的不确定因素。因此，不确定性可以传播到最终的后处理步骤中。本文通过用传统的短路短路快速算法和一种涉及优化的算法计算校准的不确定度，验证了这一概念。观测到的不确定度之间的差异小于0.3%，这可以用数字误差来解释。
This paper describes a software, METAS VNA Tools II, which is designed to compute uncertainties of coaxial S-parameter measurements. A bottom-up concept is used. Thus basic influence quantities are propagated through the calibration of the vector network analyzer to the S-parameters of a device under test. METAS UncLib is used for the linear propagation of uncertainties. The result is not only an uncertainty region but a list of uncertainty contributions with correlations. Thus the uncertainties can be propagated into eventual post-processing steps. In the present paper the concept has been verified by computing uncertainties of a calibration with a traditional quick short open load thru algorithm and an algorithm which involves optimization. The observed differences between the resulting uncertainties are lower than 0.3 percent, which can be explained by numerical inaccuracies.