Rayleigh 方程
当谐振器的横向尺寸增大到超出细线的范围时（即谐振器不再“细”），其调谐长度会减小。Rayleigh 方程可近似描述有限长度等截面圆柱体的这一现象。
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Rayleigh equation
As the lateral dimensions of a resonator increase beyond a thin wire (i.e., the resonator is no longer "thin"), the tuned length decreases. The Rayleigh equation approximately accounts for this phenomena for a finite length prismatic cylinder.
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