电路辐射干扰机理诊断与特性估计  

EMI Radiated Noise Diagnosis and Estimation for HF Circuits

作　　者：赵阳[1,2] 颜伟[1] 赵波[3] 罗永超[1] 李世锦[1] 

机构地区：[1]南京师范大学电气与自动化学院,南京210042 [2]东南大学毫米波国家重点实验室,南京210096 [3]江苏省计量科学研究院电磁兼容产品测试所,南京210007

出　　处：《电工技术学报》2010年第10期6-13,共8页Transactions of China Electrotechnical Society

基　　金：江苏省自然科学基金(BK2008429);毫米波国家重点实验室开放基金(K200803);中国博士后科学基金(2004036147)资助项目

摘　　要：针对远场测试无法准确获取电路辐射机理且电磁测量过程复杂问题,提出基于近场测量的高频电路辐射机理快速诊断和基于电路射频参数测量的空间场辐射特性快速预估方法。首先,通过近场电磁场天线测量得到波阻抗及与测试点空间位置关系,分别根据共模和差模辐射的近场特性进行机理诊断;其次,根据共模辐射电流与空间总辐射场之间关系,得到基于射频共模电流分析的辐射EMI估计方法;最后,完成了针对不同无线通信设备和高速数字PCB的辐射干扰诊断与抑制实验,结果验证了文中方法的有效性。此外还利用美国ETS-Lindgren公司3m法标准电波暗室做了对比测试,结果吻合较好且误差小于5.13%。Since it＇s not easy to detect the radiated electromagnetic interference（EMI） mechanism of high frequency（HF） circuits by using far field-based measurement and also for the complexity of electromagnetic（EM） measurement,a diagnosis approach for radiation mechanism based on near field measurement together with an estimation approach for radiated EMI in space are presented in this paper for HF circuits.First,according to the relationship between the wave impedance achieved by near field EM probe measurement and the measured field point＇s position,the radiation mechanism diagnosis could be realized on the use of performance analysis of common mode（CM） and differential mode（DM） radiation in near field.Next,considering the governing relation between the CM radiated current and its total EM field in space,the estimation approach could then be acquired based on RF common mode current measurement.Additionally,some experiments for different wireless communication devices and HF digital printed circuit boards are completed using above methods and also results are compared with chamber results which shows good agreement（error5.13%）,and thus good validity.

关 键 词：电磁兼容 电磁干扰 高频电路 机理诊断 特性预估 

分 类 号：TM461[电气工程—电器] TN03[电子电信—物理电子学]