Q3D求解过孔的电感值为什么跟公式计算的对不上？
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可能存在几点原因：1）公式比较老，误差大；2）公式中并没有说明单位，一些网站上的说法是inch。下图所示的论文中的公式（1），跟仿真结果可以对应起来（文中的导磁率u应该写错了，少了个pi）
具体请参考论文Accurate Inductance Modeling of 3-D Inductor Based on TSV
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