D. Yb3+-deoped fiber ring laser working at 1053nm with narrow bandwidth was realized by using band-pass filter.2.
D．采用带通滤波器，实现了掺Yb~(3+)光纤环形激光器中心波长为1053nm，窄线宽的激光输出。
参考来源 - 掺Yb～（3+）光纤超短脉冲激光器的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Because of their narrow bandwidth, CF signals portray only the target's presence and, in the case of some bat species, its motion relative to the bat's.
因为它们的频宽很窄，CF 信号只能描绘目标的存在，而对于一些种类的蝙蝠来说，CF 信号还能描述目标相对于蝙蝠的运动。
And the standard microstrip antenna has a very narrow bandwidth of 1 ~ 5%.
同时，一般的微带天线的带宽比较窄，在1 ~ 5%。
The narrow bandwidth property of a microstrip antenna is one of the important reasons to restrict its wide application.
微带天线的窄频特性是限制它广泛应用的原因之一。
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