Thin Dielectric Sheets
A thin dielectric sheet can be applied to the one side of a face to model flat multilayer dielectric structures. Typical applications include radome covered antennas and windscreens of automobiles.
Figure 1. The order of the layers for thin dielectric sheets is important when used in conjunction with RL-GO and UTD.
For example, a model is simulated with two layers. One layer is a good absorber and the second, a good conducting layer. When a ray is incident on the side of the absorber, the reflection is zero. When a ray is incident on the side of the conducting layer, the reflection coefficient is -1. The transmission factor in both cases is zero.
The definition of which side is the front / rear is determined by the normal vector n of the triangles. If one ray is incident in the direction of the normal vector (ray 1) and as a result hits the first layer (index number n - layer with the highest index number). An incident ray in the opposite direction of the normal vector (ray 2) will first hit the layer with the lowest index number.