Use of Double Differential-mode Current Injection Method Equivalent to High Level Illumination for Susceptibility Testing  

作　　者：LU Xinfu WEI Guanghui PAN Xiaodong 

机构地区：[1]Institute of Electrostatic and Electromagnetic Protection, Mechanical Engineering College, Shijiazhuang 050003, China

出　　处：《高电压技术》2013年第10期2431-2437,共7页High Voltage Engineering

基　　金：supported by National Basic Research Program of China(973 Program)

摘　　要：To achieve the electric field strength and the induced currents in equivalence in susceptibility tests with the high-level field radiation above 400 MHz,a double differential-mode(DM) current injection method based on directional couplers is proposed.Two cascaded symmetrical directional couplers compose a coupling device to inject the DM currents.When the coupling device is used,two devices are necessary to achieve the equivalence between radiation and injection,i.e.the equivalence between the injected voltages and the field strength,which is linear,regardless of the characteristics of the equipment under test(EUT).The results are verified by experiments using typical coaxial cables and nonlinear devices,where the equivalence between the nonlinear EUT responses induced by radiation and injection at both ends is achieved by using two coupling devices.At a frequency up to 1.75 GHz,the maximal experimental error is only 3.39%.The experimental results confirm the accuracy of the proposed method even both the EUTs work in the nonlinear region.The proposed method is applicable for radiated susceptibility(RS) testing of interconnected systems in the microwave frequency band.To achieve the electric field strength and the induced currents in equivalence in susceptibility tests with the high-level field radiation above 400 MHz, a double differential-mode （DM） current injection method based on directional couplers is proposed. Two cascaded symmetrical directional couplers compose a coupling device to inject the DM currents. When the coupling device is used, two devices are necessary to achieve the equivalence between radiation and injection, i.e. the equivalence between the injected voltages and the field strength, which is linear, regardless of the characteristics of the equipment under test （EUT）. The results are verified by experiments using typical coaxial cables and nonlinear devices, where the equivalence between the nonlinear EUT responses induced by radiation and injec- tion at both ends is achieved by using two coupling devices. At a frequency up to 1.75 GHz, the maximal experimental error is only 3.39%. The experimental results confirm the accuracy of the proposed method even both the EUTs work in the nonlinear region. The proposed me- thod is applicable for radiated susceptibility （RS） testing of interconnected systems in the microwave frequency band.

关 键 词：电流注入法 药敏试验 差模 定向耦合器 非线性器件 照明 实验误差 电场强度 

分 类 号：TN911.7[电子电信—通信与信息系统] V441[电子电信—信息与通信工程]