Characterised Surfaces for FSS

Use characterised surfaces with ray launching geometrical optics (RL-GO) for an efficient solution of a frequency selective surface (FSS).

Characterised surfaces are defined with a .tr file that describes the transmission and reflection properties of the surface as a function of both frequency and angle of incidence (θ , ϕ). The first part of this example demonstrates how to create the .tr file for an FSS element. The second part of this example demonstrates how a characterised surface can be defined, using the .tr file.
Note: Characterised surfaces are only supported with the RL-GO method.