Subject :- Mobile Communication

Topic :- GSM

Difficulty :- Low

In EM wave propagation knife-edge effect or edge diffraction is a redirection by diffraction

of a portion of the incident radiation that strikes a well-defined obstacle such as a mountain range or the edge of a building.

The knife-edge effect is explained by Huygens- Fresnel principle which states that a well-defined obstruction to an electromagnetic wave acts as a secondary source, and creates a new wave front. This new wave front propagates into the geometric shadow area of the obstacle.