本文依据功率传输方程，导出了在失配条件下镜像法测量增益的简化公式，分析了失配对增益测量的影响。
A simplified formula of the gain measurement by the image method is derived according to the power transmissions equation. The effect of mismatch on the gain measurement is analysed.
根据架空输电线的特点，在二维边界元方程中用镜像单元考虑了大地的影响。
According to the characteristic of the overhead power line, the image boundary elements are putted in the position under ground to consider the effect of the earth.
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