基于SYSTEMⅡ的新型微波中功率计量系统

摘要

SYSTEMⅡpower transfer system is one of widely used schemes in field of calibration for microwave power sensors. By analyzing the theory of the SYSTEMⅡand traditional calibration method of medium power, a scheme was brought forward to develop calibration of medium power using SYSTEMⅡ power transfer system. Low reflectance equivalent signal source is adopted to make medium power equivalent signal source with low reflectance, steady output and adjustable output electrical level. Medium power attenuator and the high-precision terminal power sensor in SYSTEMⅡpower transfer system are used to make medium power transfor standard. By means of alternate comparison, the high-preci-sion automatic calibration can be realized for medium power sensors.%SYSTEMⅡ功率传递系统是微波小功率计量领域内应用比较广泛的测试系统之一，通过对传统中功率计量方法的分析研究，提出了利用SYSTEMⅡ功率传递系统实现中功率计量的构建方案。采用低反射系数等效信号源结构，构成反射系数小、输出稳定、输出电平可调的中功率等效信号源；采用中功率衰减器和SYSTEMⅡ功率传递系统中含有的高精度终端式小功率座构成中功率传递标准，通过交替比较法，实现微波中功率计的高精度自动校准。