摘要
电磁混响室已被大量用于辐射抗扰度测试,但在辐射发射测试方面还有待深入研究。替代法是电波暗室中常用的辐射总功率测量方法,其测试准确度高、重复性好。为此,使用各种标准天线作为被试品,通过计算仿真和试验测量,研究替代法用于混响室辐射总功率测试的可行性,在此基础上选取替代法的标准辐射源,明确基于标准辐射源的辐射总功率计算方法。研究结果表明,不同天线作为被试品时混响室工作区内的电场分布均满足场均匀性要求。混响室测得的辐射功率受被试品的形状、辐射方向影响很小,因此可以用标准天线来替代被试品,使用替代法进行辐射发射测试。选择偶极子天线作为标准天线,辐射总功率、自由空间场强均可按照IEC 61000-4-21的标准公式计算。
Electromagnetic reverberation chamber has been widely used in radiated-immunity test.Substitution method is often used to measure the total-radiated power in anechoic chambers due to its accurate test result and enhanced test repeatability.Based on the numerical simulation and the experimental data,the substitution method in reverberation chamber was investigated by using several kinds of standard antennas as EUT（equipment under test）.Then,the standard radiating source and the corresponding calculation method of the total-radiated power were determined.It is revealed that all the antennas under test can produce suitable uniform electric field in the reverberation chamber.The influence of the shape and the radiating direction of EUT on the measured total-radiated power in reverberation chamber is not remarkable.Thus,EUT can be substituted by standard antennas,and the substitution method can be used to measure the total-radiated power in reverberation chamber.Usually,the dipole antennas can be selected as standard antenna,and the total-radiated power and the electric field in free space can be calculated by the formulas presented in IEC 61000-4-21.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2011年第12期2885-2890,共6页
High Voltage Engineering
基金
国家自然科学基金(60771010)~~
关键词
混响室
辐射发射测试
替代法
辐射总功率
标准天线
电磁兼容
reverberation chamber
radiated-emission test
substitution method
total-radiated power
standard antenna
electromagnetic compatibility
