由于电磁场的量子化效应，电磁系统发射有限能量的电磁场，其频谱必有一高频率上限。
Due to the quantization of electromagnetic fields there is an upper frequency limit in the spectrum of any finite energy transmitted by an electromagnetic system.
被动探测使用毫米波辐射计，不发射电磁波，因而没有电磁污染和目标闪烁效应，工作比较隐蔽，不易被发现。
Passive detection uses MMW radiometer, which does not emit electromagnetic wave, has no glitter effect and works snugly.
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