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.
代明珍,崔孝海,刘欣萌. WR-28功率基准系统中等效源反射系数校准研究[J]. 计量学报, 2012, 33(1): 68-72.
DAI Ming-zhen,CUI Xiao-hai,LIU Xin-meng. Research on Calibration of the Equivalent Source Reflection Coefficient in WR-28 Power Standard System. Acta Metrologica Sinica, 2012, 33(1): 68-72.
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2012, Vol. 33 
