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对于时谐电磁场，推导出求解矢位的球面波函数展开式，应用该展开式可计算电流分布区域外部和内部的时谐电磁场，给出了用文中公式求解时谐电磁场的具体例子。
For the time-harmonic electromagnetic field, the spherical wave function expansion formula for solving the sagittal position is deduced. Using this expansion method, the time-harmonic electromagnetic field can be calculated both inside and outside the current distribution region.