@月合大等 Diffraction Described by the Huygens-Fresnel principle and the principle of superposition of waves. The wave propagation visualized by considering every point on a wave front as a point source for a secondary spherical wave. The wave displacement at any subsequent point is the sum of these secondary waves. Sum of waves is determined by the relative phases as well as the amplitudes of the individual waves so that the summed amplitude of the waves can have any value between zero and the sum of the individual amplitudes. ■ Diffraction patterns usually have a series of maxima and minima. 122h,+h Graduate course:Propagation Channel Characterization,Parameter Estimation and Modeling 54/199 Diffraction Graduate course: Propagation Channel Characterization, Parameter Estimation and Modeling 54 / 199 ■ Described by the Huygens-Fresnel principle and the principle of superposition of waves. ◆ The wave propagation visualized by considering every point on a wave front as a point source for a secondary spherical wave. ◆ The wave displacement at any subsequent point is the sum of these secondary waves. ■ Sum of waves is determined by the relative phases as well as the amplitudes of the individual waves so that the summed amplitude of the waves can have any value between zero and the sum of the individual amplitudes. ■ Diffraction patterns usually have a series of maxima and minima