铁磁共振实验中，在恒定磁场的作用下，待测样品磁导率的变化会引起谐振腔谐振频率ω的偏移，即频散效应，其对铁磁共振曲线有明显的影响. 本论文采用传输式谐振腔测量了铁磁共振曲线，观察到了明显的频散效应，从铁磁体本身对谐振腔谐振频率的影响出发，采用微扰理论，很好地解释了频散效应的产生原因及对铁磁共振曲线的影响，从而解决了铁磁共振实验教学过程中的一个难点.

In ferromagnetic resonance experiment, under the action of a stable magnetic field, the change of the permeability of samples to be measured will cause a shift of the resonant frequency ω of the resonant cavity. that is the dispersion effect, which has a significant impact on the ferromagnetic resonance curve. Transmission resonator is applied to measure the ferromagnetic resonance curve in experiment, and obvious dispersion effect appeared. Based on the influence of the ferromagnet on the natural frequency, the perturbation theory is adopted to explain the cause of the dispersion effect and its influence on the ferromagnetic resonance curve. Thus it solves a difficult point in the teaching process of ferromagnetic resonance experiment.