基于近场扫描的屏蔽罩内辐射源重构方法  

A Source Reconstruction Method in Shielding Enclosure Based on Near-field Scanning

作　　者：肖启晗 宋天豪 郭东风 Xiao Qihan;Song Tianhao;Guo Dongfeng

机构地区：[1]浙江大学信息与电子工程学院 [2]OPPO广东移动通信有限公司

出　　处：《安全与电磁兼容》2023年第4期29-34,41,共7页Safety & EMC

摘　　要：提出的屏蔽罩内辐射源重构方法,采用仅包含幅值信息的近场扫描技术,克服了精确测量相位信息的困难。首先,扫描屏蔽罩不存在时自由空间中真实未知电磁干扰(EMI)源的幅值近场云图,应用动态差分进化(DDE)算法获得等效偶极子模型。然后,将等效偶极子模型连同屏蔽罩模型带入全波仿真,用以表征屏蔽罩中的未知EMI源。经仿真和测量实例验证,存在屏蔽罩情况下,受扰微带线耦合电压的测量值和仿真预测值之间的最大偏差小于6 dB,等效偶极子模型可以用来表征屏蔽罩中的未知EMI源。最后,结合工程应用,建议屏蔽罩内受扰微带线摆放应恰当选择倾角并分别考虑非谐振频率和谐振频率两种情况时与EMI源的耦合关系。An effective source reconstruction method in shielding enclosure is proposed in this paper.Magnitudeonly near-field scanning technology is employed to overcome the difficulty of precisely measuring the phase.After scanning the magnitude-only near-field of real unknown electromagnetic interference(EMI)source in freespace,a global optimization algorithm named dynamic differential evolution(DDE)method is applied to obtain the equivalent dipole model.Then,the proposed equivalent dipole model can be used to represent the unknown EMI source in shielding enclosure.The simulation and measurement examples verify that the error between the measured microstrip coupling voltage and the simulation predicted voltage is less than 6 dB in the shielding.Finally,combined with engineering applications,it is suggested that the angle of disturbed microstrip in the shield should be properly selected and the cavity resonant frequency should be considered.

关 键 词：电磁干扰 差分进化算法 等效偶极子模型 近场扫描 

分 类 号：TN03[电子电信—物理电子学]