The possibility is shown that most of the energy may be reflected in the air for an electromagnetic wave of specific wave - length and incidence at a specific angle 文中给出了发生强烈定向反射时，声波波长、电磁波波长和入射角等应该满足的条件，并且计算了反射峰的宽度。
4.
The modulation in the refractive index of electromagnetic waves due to interference of two coherent propagating acoustic waves in the atmosphere is modeled by a periodic layered structure 摘要以电磁波折射率具有周期性变化的层状结构来模拟空气中两个相距较远的相干声源干涉形成的中心区域，研究了结构对电磁波定向反射的特性。
