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

在实际应中，共振腔的受到安装空间的限制，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，在光子微域的角处，你可以看见环形谐振电路，这是传统的方式（非光子晶体方式）于滤波器等的谐振腔。

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

外激励的驱动方式可以扁环型谐振管产生有效的行波分量，在谐振频率下，谐振管腔的综合变形量最大。