Research The Measurement Techniques Of WR-15Microwave Power National Standard

As one of the most important basic parameter of wireless, microwave power has important significance and plays an important role. Demands for calibrations between50GHz to75GHz is growing fast in the recent years. Therefore, we should establish a national standards system quickly to cope with the demand for wide-band, various type of transfer standard.The main contents in this paper is to research the measurement techniques of WR-15Microwave power national standards, which is used to broaden the bandwidth of existing standards and lay the technical foundation for the higher frequency power standard.This paper begins with introduction about the background and significance of this project and the research status of microwave power standards in all countries, and then it also presents the system design of power standard, including the microcalorimeter, peripheral devices, the automated test and control software, meanwhile provides formula derivation and the measurement of effective efficiency and correction factor. Next it introduces two methods of calculating the correction factor, namely the traditional method and the new method based on the theory of electromagnetic field. At last the results and uncertainty analysis are presented.This paper introduces a WR-15rectangular waveguide microcalorimeter which adopts symmetrical double load structure. In order to reduce the effects of temperature changes in the laboratory, we place two copper blocks in the microcalorimeter creatively. A new method based on electromagnetic field theory to calculate the correction factor is presents. A detailed analysis of its superiority over the traditional method is shown. It reduces the uncertainty of the correction factor reasonably, in other words, reduces the uncertainty of the microwave power standard.