混响室测试区场均匀性分布规律仿真分析

为了研究混响室工作区(或称测试区)场均匀性分布规律,用电磁仿真软件FEKO建立了混响室的物理模型。采用矩量法结合物理光学法,计算混响室测试区24个位置的电场强度,比较得出的3个大小不同测试区电场的标准偏差,发现工作区域2的标准偏差小于工作区域1的标准偏差,而工作区域3的标准偏差小于工作区域2的标准偏差,这说明电场的均匀性随测试区体积的减小而提高,越靠近工作区的中央电场均匀性越好,用于进行电磁兼容测试的待测物最好放在工作区的中央位置。

Simulation Analysis of Field Uniformity Distribution in the Test Space of a Reverberation Chamber

In order to study the distribution rule of the field uniformity in the test space(or work space)of a reverberation chamber by using numerical calculation,a physical model of a reverberation chamber is established by the electromagnetic simulation software FEKO.Electric field intensity in twenty-four positions of the test space of a reverberation chamber is calculated by using the method of moment(MOM)and physical optics(PO).Standard deviations of electric field of three test spaces with different volumes are calculated.It is discovered that the standard deviation of NO.2 work space is less than that of NO.1 work space,and the standard deviation of NO.3 work space is less than that of NO.2 work space.This verifies that the field uniformity in the test space is improved with the volume reduction of the test space.The field uniformity is better when the position is closer to the centre of the work space.The equipment under test(EUT)which is used to carry out EMC test is requested to be put in the centre of the work space.