长期以来，解决微波功率晶体管的电流集中问题的通用做法是使用发射极镇流电阻，以及PTC, CTR热敏电阻等无源器件。
For a long time, a common and popular method to solve current convergence problem of microwave power transistor is using emitter ballasting resistor, such as PTC, CTR thermistor, passive devices etc.
在具有纳米天线的光伏设备中，纳米管天线可以将进入光伏设备且没有转换成电流的光子集中起来。
In such a device, the antenna would concentrate photons before the photovoltaic cell converts them to an electrical current.
其屏蔽盒应用主气隙，防止原电流产生的磁场集中在屏蔽壳的金属板内。
Its shielded box should be used the main air gap and prevent the primary current to produce the magnetic field concentrating in the shield shell metal plate.
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