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研制了8mm波段(26.5～40.0GHz)精密功率测量系统,它既可用作校准终端型功率计的小功率传递标准,又可用于稳定8mm波段信号源的输出功率,为各种精密测量提供稳定的低输出反射系数信号源。 测量系统由高方向性3dB定向耦合器及其旁臂精密功率计和稳幅环路组成。3dB耦合器采用宽壁Tchebycheff耦合孔阵设计,方向性达40dB;精密功率计由恒温热敏电阻座和高精确度四端电阻自平衡电桥组成;稳幅环路包括一台多用稳幅器和PIN电调衰减器。恒温热敏电阻座的温度漂移小于±1μW/℃·h;直流替代功率测量准确度为±(0.1％+0.2μW);稳幅后,信号源输出功率稳定度优于±0.02％/30min,此时毋需调配,测量系统等效信号源的输出VSWR小于1.05(反射系数模值小于0.025)。 文中给出了该测量系统的测量数据和用作小功率传递标准时的误差分析。
Developed an 8mm band (26.5 ~ 40.0GHz) precision power measurement system that can be used as both a low power transfer standard for calibrating a terminal power meter and a stable output power for a 8mm band signal source, providing stability for a wide range of precision measurements Low output reflection coefficient signal source. The measurement system consists of a highly directional 3dB directional coupler with its parapet precision power meter and steady amplitude loop. 3dB coupler using wide-wall Tchebycheff coupling hole array design, the direction of up to 40dB; precision power meter by the thermostat thermistor base and high-precision four-terminal resistance bridge from the balance; stability loop includes a multi-purpose amplitude modulator And PIN electrical attenuator. The temperature drift of the thermistor base is less than ± 1μW / ℃ · h; the accuracy of the DC alternative power measurement is ± (0.1% + 0.2μW); the stability of the output power of the signal source is better than ± 0.02% / 30min, No need to deploy at this time, the measurement system equivalent signal source output VSWR less than 1.05 (reflection coefficient of less than 0.025). The measurement data of the measurement system and the error analysis when used as the standard of low power transmission are given in the paper.