INFLUENCE OF SOLT CALIBRATION STANDARDS ON MULTIPORT VNA S-PARAMETER MEASUREMENTS
Wei Zhao, Jian‐Kang Xiao, H. Qin · Electromagnetic waves · 2014
For the GSOLT calibration algorithm of n-port vector network analyzers (VNA), the sensitivity coefficients for the S-parameters of the n-port device under test (DUT) are developed as functions of the S-parameter deviations of SOLT standards.By introducing the generalized flow graph of the 3n-term error model, analytic formulas for the S-parameter deviations of the n-port DUT with respect to the error terms have been deduced.In addition, expressions for the deviations of the error terms in regard to the nonideal calibration elements are given by a series of matrix operations.Finally, the analytic expressions of the sensitivity coefficients are concluded, which can be used for establishing the type-B uncertainty budget for S-parameter measurements.