The usage of Helmholtz resonator is restrained by the space, which is only available for rectangular resonator somewhile.

在实际应用中，共振腔使用往往受到安装限制，有时候只能安装矩形腔。

Finally, in the micropolis corners you can see ring resonators, which are a conventional (non photonic-crystal) way to achieve a resonant cavity for use in channel-drop filters, etcetera.

最后，在子微域角处，你可以看见环形谐振电路，这是用传统方（子晶体方）来表示用于滤波器等谐振腔。

The external inspirator is available to drive the resonator to produce traveling wave.Under resonant frequency the distortion of resonator reached a peak.

外激励驱动方可以使扁环型谐振管产生有效行波分量，在谐振频率下，谐振管腔综合变形量最大。