The band-pass filters use parallel-coupled lines which is very common and efficiency.
带通滤波器则采用了技术成熟的平行耦合线结构来实现。
参考来源 - 小型化K波段下变频组件的设计·2,447,543篇论文数据，部分数据来源于NoteExpress
阐述了平行耦合线定向耦合器的工作原理和设计过程。
This paper explained the work theory and the process of design about the parallel coupled line directional coupler.
本文分析了三线平行耦合线带通滤波器的设计原理，给出了有关设计曲线。
The design principle is analysed for band-pass filters using three parallel coupled-lines and the related design curves are given.
该滤波器采用数个环形谐振器平行耦合，而输入输出馈线与环形谐振器之间采用直接耦合。
This filter USES several parallel-coupling ring resonators and direct-coupling structure between feed lines and rings.
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