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

在实际应用中，使用往往受到安装空间限制，有时候只能安装矩形。

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，在光子微域转角处，你可以看见环形谐电路，这是用传统方式（非光子晶体方式）来表示用于滤波器等谐。

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

外激励驱动方式可以使扁环型谐管产生有效行波分量，在谐频率下，谐管综合变形量最大。