耦合去耦网络的耦合系数和去耦衰减的校准

Calibration study on coupling factor and decoupling attenuation of coupling/decoupling networks

介绍了电磁兼容试验和测量技术射频场感应的传导骚扰抗扰度中所用耦合去耦网络的耦合系数和去耦衰减的校准方法。首先,给出了耦合系数和去耦衰减的定义和技术指标,根据定义和技术指标,给出了校准所用标准器。标准器除了网络分析仪、同轴精密负载、同轴固定衰减器和辅助器件-参考接地平面外,还需要添加标准150Ω/50Ω阻抗适配器,以实现150Ω平衡端与50Ω不平衡端之间的阻抗转换。文中给出了校准连接示意图、校准时的注意事项、耦合系数和去耦衰减的计算公式,以及耦合系数不确定度评定结果。

This paper proposes a reliable CDN calibration method of coupling factor and decoupling attenuation applied to the field of electromagnetic compatibility tests and conducted disturbances included by radio-frequency fields immunity tests.At the beginning of this paper,the definitions and technical specifications of coupling coefficient and decoupling attenuation of CDN are given,according to the definitions and technical specifications,the standard instruments used for calibration are given.In addition to the network analyzer,coaxial precision load,coaxial fixed attenuator and auxiliary device reference grounding plane,a special standard 150Ω/50Ωadapter is also required to realize the impedance conversion between 150Ωbalanced to 50Ωunbalanced.The connection diagram during calibration,precautions during calibration,calculation formulas of coupling coefficient and decoupling attenuation are given.Finally,the evaluation results of uncertainty of coupling coefficient are given.