Electromagnetic Diffraction Modeling and Simulation

EM diffraction is critical in many applications including antennas and propagation. Understanding and visualizing EM wave–object interaction is crucial in designing new antenna systems, for predicting path losses through complex propagation paths, etc. In order to do that wave pieces such as diffracted waves, Fringe waves, etc., should first be studied on canonical structures. Then, complex objects can be investigated by using HFA as well as numerical methods in hybrid form intelligently. EM wave scattering from waves – objects interaction has long been investigated. Interesting wave phenomena, diffraction, occur when objects have sharp edges and tips. Methods are known as High-Frequency Asymptotics,
such as Geometric optics (GO), Physical Optics, (PO), Geometrical Theory of Diffraction, (GTD), Uniform Theory of Diffraction (UTD), Physical Theory of Diffraction (PTD), and Theory of Edge Diffraction (TED) have been successfully applied to a variety of EM problems. Recently, numerical methods, such as the Finite Difference Time Domain (FDTD), Method of Moments (MoM), and Finite Element Method (FEM) have also
been used in modeling EM diffraction. These powerful methods, together with novel approaches, have shown to be successful not only in modeling EM diffraction but also in distinguishing wave pieces such as scattered waves, diffracted waves, Fringe waves, etc., which is very important in visualizing and understanding complex wave–object interaction. This lecture will review all these approaches, use recently developed EM virtual tools, and present comparisons through canonical examples.

Speaker(s): Prof. Levent Sevgi,

Bldg: Hanover Manor, 16 Eagle Rock Avenue , East Hanover, Istanbul, Turkey, 07936