Analysis of the Influence on Measurement Accuracy Caused by VNA Hardware Performance
By deeply analyzing the source of error in the S-parameters measurement process of vector network analyzer(VNA),in this paper an appropriate corresponding relationship is then established between error terms and hardware perform-ances.On this basis,the relevance between the deviations of raw measured S-parameters and error terms are analyzed by regarding the raw and final measured values as the multivariate functions of the error terms,with the linear terms of Taylor's series as reason-able estimations of the error near the ideal values of the error terms.Increment method is utilized for other items except original measurement in this analytical expression to calculate the relationship between the deviations of final S-parameters measurements and error terms.Hence,the deviation values in measurement results attributed to the hardwave performances are determined.Fi-nally,two different VNAs(Keysight N5227A and Ceyear 3671E)are utilized to measure the network under test with known param-eters serving the same calibration steps.The correctness and effectiveness of the method are verified by comparing the final meas-urement results.
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