多层印制电路板边缘辐射的一种精确计算方法  

An accurate method of calculating the radiated emission from multilayer printed circuit board edge structures

作　　者：胡玉生[1] 温舒桦[2] 范峻 

机构地区：[1]集美大学机械与能源工程学院,福建厦门361021 [2]北京邮电大学电子工程学院,北京100876 [3]EMC Laboratory,Missouri University of Science and Technology,Rolla,MO GS409,USA

出　　处：《电波科学学报》2013年第6期1027-1032,1040,共7页Chinese Journal of Radio Science

基　　金：福建省教育厅资助项目(JA11162)

摘　　要：研究了精确评估多层印制电路板电源分布网络辐射发射的计算方法.采用高效的两维边界元法计算出信号返回电流经过电源/地平面的阻抗,将过孔转换结构的等效物理电路模型与外部电路连接成整体电路,采用电路仿真的方法获得精确的辐射发射激励电流.由边界元法计算出激励电流在电源/地平面边缘产生的场分布,进而由边缘场的等效磁流求出远区的辐射场.计算了不同频率时的辐射发射激励电流及最大辐射值.研究结果表明:在反谐振频率处辐射场达到极大值.计算结果与全波有限元电磁场仿真的结果基本吻合.An accurate method for evaluating the radiated emission from power dis- tribution system in multilayer printed circuit boards was investigated. Firstly, the impedance caused by signal current returning through power and ground （P/G） planes was calculated using high efficient 2D boundary element method（BEM）,then the equivalent physics circuit model of via transition was connected with exterior circuit to form integral circuit, so the preeise excitation current can be obtained through circuit simulation method. The field distribution on the peripheral surfaces of P/G planes induced by the excitation current was also calculated by BEM, finally the far field radiation was obtained through equivalent magnetic current of edge field. The radiation excitation current and maximum radiated emissions were provided for different frequencies. Research results show that the radiation reaches its maximum value at anti-resonance frequencies. The obtained results agree very well with those from electromagnetic simulation based on full-wave finite element meth od.

关 键 词：辐射发射 多层印制电路板 过孔 电源 地平面 激励源 边界元法 

分 类 号：TN972[电子电信—信号与信息处理]