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I see the following warning:
Warning 1010: Assumptions of UTD not fulfilled
What does it mean and what should I do to fix it?
For edge diffraction within the UTD context, a largeness parameter K is defined as K = BETA * L * SIN(Alpha_i)^2 with BETA wavenumber 2*pi/lambda Alpha_i angle of the diffraction cone (i.e. angle between incident ray and edge) L distance parameter, which for a spherical wavefront can be computed from L = R*S/(R+S) * sin(Alpha_i)^2 with R = radius of the spherical wavefront S = distance of the wave between the diffraction point and the observation point (for double diffraction then the distance between first and second diffraction point) For the UTD diffraction formulas to be valid, the largeness parameter K must be larger than 1. If it is too small, then typically the separation distances for double diffractions are too short, or a MoM region is too close to a UTD edge. Normally this warning 1010 is not very serious, since the other ray contributions (direct, reflected ray) would dominate.
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