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本文提出了在垂直照射由二个无色散介质所构成的反射界面的情况下，正弦调制的调频波产生合成驻波的条件：和这个条件在令时，根据不同的ｐ＋ｑ值（奇数或偶数）所呈现的不同形式： １．ｐ＋ ｑ＝奇数， ２． ｐ＋ ｑ＝偶数＝２ ａ，还给出了反射系数相角与反射界面至相邻合成驻波节的间距之间的关系： θ＝ ２βο［－ ｘ］ｈ＝ο－（２ｍ＋１）π， ０≤θ≤π。最后又作出了调频波产生这种合成驻波的物理解释。
In this paper, the condition of generating a standing wave by generating a sinusoidal modulated FM wave in the case of vertical illumination of a reflective interface consisting of two non-dispersive media is given: According to different p + q values (odd or even) The different forms presented: 1. p + q = odd number, 2. p + q = even = 2 a, the relationship between the phase angle of the reflection coefficient and the distance from the reflection interface to the adjacent composite nodes is also given: θ = 2βο [- x] h = ο- ≤ θ ≤ π. Finally, the physical explanation of this synthetic standing wave is given.