Abstract The equivalent source reflection coefficient is an important parameter to determine the effective efficiency of the calorimeter and analyze the uncertainties and transfer power standard in WR-28 power in the reference system. And it is irrespective of the signal generator in this power system,only depends on the directional coupler connected with the calorimeter.Three measurement methods: traditional three ports method,the direct calibration method and Shimaoka K method are introduced.The experiments are first operated with Shimaoka K method in 26.5~40 GHz,to measure the equivalent source reflection coefficient of the directional coupler.The best method is determined by analyzing and comparing the results obtained from the three methods.The experiment results show that Shimaoka K method is not only feasible,but also the best choice in WR-28 power standard system due to its comprehensive advantages.The uncertainty of equivalent source reflection measurement is also evaluated by the Shimaoka K method.
DAI Ming-zhen,CUI Xiao-hai,LIU Xin-meng. Research on Calibration of the Equivalent Source Reflection Coefficient in WR-28 Power Standard System[J]. Acta Metrologica Sinica, 2012, 33(1): 68-72.
［1］Wallis T M,Lewandowski A.Statistical Measurement Techniques for Equivalent Source Mismatch of 1.85 mm Power Splitter［C］//72nd ARFTG Microwave Measurement Symposium,Portland,Oregon,2008.
［2］冯新善,吴幼璋,赵基,等.高频、微波功率的计量测试［M］.北京:中国计量出版社,1987.
［3］Juroshek J R.A direct calibration method for measuring equivalent source mismatch ［J］.Microwave Journal,1997,40(10):106-116.
［4］翟杰.国家宽带功率基准传递系统的研究［D］.北京: 北方交通大学,2007.
［5］Shimaoka K.A New Method for Measuring Accurate Equivalent Source Reflection Coefficient of Three-port Devices［C］// 2010 Conference on Precision Electromagnetic Measurements (CPEM),Daejeon,2010.
［6］Davidovitz M.Reconstruction of the S-matrix for a 3-port Using Measurements at Only Two Ports［J］.IEEE Microwave and Guided Wave Letters,1995,5(10):349.
［7］刘欣萌.高频和微波功率基准及其应用研究［D］.哈尔滨:哈尔滨工业大学, 2007.
［8］崔孝海,曲璐.蒙特卡洛方法在微波功率测量不确定度分析中的应用［J］.计量学报, 2008,29(1): 77-79.
2012, Vol. 33 
