泊松耦合
一种由泊松比引起的效应，它将轴向运动转换为垂直于螺柱轴线的横向运动。泊松耦合的横向运动在波节区最大（即谐振器振动时波节区会"呼吸"）。
泊松耦合还会导致谐振器端面和螺柱表面处的振幅不均匀。泊松耦合效应随泊松比以及谐振器横向尺寸的增大而增强。
对于横向尺寸较大的谐振器，采用开槽来减弱泊松耦合效应。
Poisson coupling
An effect, due to Poisson's ratio, that transforms axial motion into motion that is transverse to the stud axis. The Poisson-coupled transverse motion is largest in the nodal_region (i.e., the nodal region "breathes" as the resonator vibrates).
Poisson coupling also causes nonuniform amplitude at the resonator's face and stud surfaces. The Poisson-coupling effect increases with Poisson's ratio and with the transverse dimensions of the resonator.
Slots are used to reduce the Poisson-coupling effect in resonators with large lateral dimensions.