本文运用叠加原理，从麦克斯韦方程的积分形式出发推导出在交变电磁场中储藏在电容器中的电场能量，并且指出了决定电容器电容数值的因素。

The energy of electric field stored in the capacitor placed in an alternating electromagnatic field is concluded by using the principle of superposition and by starting with Maxwell equations.

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目前，人们提出的复合电源系统主要由“蓄电池+超级电容器”组成，但这种思路把两者比能量低的缺点叠加了，同时电容器的成本较高。

At present, the hybrid power generally composed by "battery + supercapacitor", but this idea overlaps the both shortcomings of low energy density, while the higher cost of the capacitor.

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该技术主要采用低通滤波和电容耦合，将数据信号叠加到电源信号上，通过同轴电缆，实现长距离功率能源与数据混合传输。

It adopts coaxial cable as the media for the data signal and power signal mixture transmission. Thus the goal of high-speed and long-distance transmission can be achieved.

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