Recent progress on microwave power standards in BIRMM

Recent progress on microwave power standards in BIRMM (Beijing Institute of Radio Metrology and Measurement) was introduced in this paper. The paper is concentrated on four principal points as follows. Firstly, the timetable about research on microwave power standard is shown in section 2 according to time sequence since 2006. Secondly, microwave power standard's brief introduction including their operational theory is presented in section 3. Thirdly, method for calorimeter's effective efficiency evaluation was provided in section 4. Finally, our plans about microwave power standards development were shown in the end.