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.
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。
An upper gain limit (UGL) as a function of frequency is then determined based on an inverse of the global transfer function (g).
随后基于全局传递函数(G)的倒数确定增益上限(ugl)作为频率的函数。
Meanwhile, there is an upper limit existing in frequency and the peak power of response will be greatly diminished only when the frequency exceeds its critical value.
同时，激励信号存在一个上界频率，当频率参数取值超过界值时，响应峰值迅速下降。
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