Uniform theory of diffraction

In numerical analysis, the Uniform Theory of Diffraction or UTD is a high frequency method for solving Electromagnetic scattering problems from electrically small discontinuities or discontinuities in more that one dimension at the same point.

The uniform theory of diffraction approximates near field electromagnetic fields as Quasi Optical and uses Ray diffraction to determine diffraction coefficients for each diffracting object - source combination. These coefficients are then used to calculate the field strength and phase for each direction away from the diffracting point.

These fields are then added to the incident fields and reflected fields to obtain a total solution.