Nowadays ,the relativity in the measurement uncertainty evaluation methods about S‐parameter isn't .A method for evaluating the uncertainty of S‐parameter is proposed .The method is based on the definition of calibration kits . Then the uncertainty of calibration kits propagates to the DUT from VNA self‐calibration .Eventually ,MCM is used to get the S‐parameters' measurement uncertainty of DUT .The relativity comsidered ,the method can get more credibility and rea‐sonable S‐parameters' measurement uncertainty of DUT .%目前,常用的 S 参数测量不确定度评定方法中均未考虑 S 参数相关性的问题,论文给出了一种2GHz ~18GHz 频率范围内 S 参数测量不确定度的评定方法,该方法从校准件的定义出发,基于 SOLT 校准技术对矢量网络分析仪进行自校准,将校准件引入的不确定度通过矢量网络分析仪传递给被测件(DUT ),通过使用蒙特卡洛仿真的方法(MCM )得到矢量网络分析仪测量 DUT S 参数的测量不确定度,评定过程中考虑了相关性问题,提高了 S 参数测量不确定度的可靠性和合理性。
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