电磁脉冲与开孔腔内PCB板级MSL间的耦合研究

发布时间：2018-08-20 17:53

【摘要】：因PCB上微带线(MSL)与外界电磁能量耦合而生成感应电流(Current),会对敏感器件造成耦合伤害。而目前对此研究的关注度不够,故以带拐角MSL的PCB板内置于开孔屏蔽腔为研究对象,以Current计算为主要切入点,进行多参数耦合特性计算。先建立相应数值模型并验证建模方法有效性后,外置平面波激励源,利用有限元法考察不同计算位置、有无屏蔽腔、MSL夹角大小及拐角补偿等参数变化对电流的影响。结果表明:直MSL上不同计算位置对Current影响不大,其数值都要比MSL弯折时要大,两者差值随频率增加而逐渐减小;谐振点处腔体抑制效果会被弱化甚至完全失效;MSL与电场E平行放置时,迹线需布成短线,MSL与电场E垂直放置时,迹线可布成长线;MSL宽度增加,电流数值会增加但趋势减缓。拐角补偿方法对提高信号完整性(SI)有效,但对降低电磁耦合作用有限。不会影响谐振点出现位置是上述多参数研究的共性结果。
[Abstract]:The inductive current (Current),) generated by the coupling of microstrip line (MSL) and external electromagnetic energy on PCB will cause coupling injury to sensitive devices. At present, the focus of this research is not enough, so the PCB board with corner MSL is taken as the research object, and the Current calculation is the main entry point to calculate the multi-parameter coupling characteristics. After establishing the corresponding numerical model and verifying the validity of the modeling method, the external plane wave excitation source is established and the influence of the parameters such as the angle of MSL and the corner compensation on the current is investigated by using the finite element method. The results show that the calculated positions on the straight MSL have little effect on the Current, and the difference between them decreases with the increase of the frequency, and the difference is larger than that of the MSL bending. The suppression effect of cavity at the resonance point will be weakened or even completely invalidated when the MSL is placed parallel to the electric field E. when the trace line needs to be placed in a short line and the electric field E is placed vertically, the width of the trace line can be increased and the current value will increase, but the trend will slow down. Corner compensation is effective in improving signal integrity (SI), but limited in reducing electromagnetic coupling. It is the common result of the multi-parameter study that the resonance point will not be affected.
【作者单位】：浙江工业职业技术学院电气电子工程分院;中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室;
【基金】：中国科学院预研基金(61501.02.03.04)
【分类号】：TN41

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