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.
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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