Abstract:

A new linear power measurement system composed of logarithmic detectors is designed for LHCD system, which can solve the problems of narrow input power dynamic range and nonlinearity of the power measurement detectors. The measured results indicate that the characteristic curve of new system has a wide dynamic range of power measurement and high linearity. The dynamic input power range is greater than 40dB when the logarithmic consistency error is from −1dB to +1dB. The correlation coefficient of >0.999 is achieved in serviceable ranges using linear fitting. These results are better than previous equipment’s.

Key words: Power measurement, LHCD, Logarithmic amplifier, Linear measurement

摘要：

为了解决在功率测量中检波器输出的非线性曲线和动态输入功率范围小等问题，为500kW/3.7GHz 的LHCD 系统设计了对数检波器，并由其组成新型线性微波功率测量系统。测试结果表明，该测量系统具有更大的动态功率测量范围，其特征曲线在本系统功率参数内具有优良的线性特性，对数一致性误差在-1dB~+1dB 范围内可输入微波功率动态范围>40dB，在系统可用范围内利用线性拟合获得的相关系数大于0.999。该结果优于以前设备测试结果。

关键词: 微波功率测量, LHCD, 对数放大器, 线性检波