带群 meaning in English

tape cluster

Applying the ways of adjusting the bandwidth , minimizing the pass band ripples and group delay ripples , a 50ghz filter is designed . in the paper , we also discuss the temperature stability of dwdm thin film narrow band - pass filter
本文总结了波分复用滤光片的各种设计方法,运用带宽调整、通带波纹的减小和通带群延迟波纹减小的方法设计出了50ghz的波分复用滤光片膜系。