RL-GO Settings
A number of optional settings are available when using ray launching geometrical optics (RL-GO) to solve parts of the model.
On the Solve/Run tab, in the Solution settings group, click the Solver settings icon. On the Solver settings dialog, click the High frequency tab.
- Decouple from MoM solutions
- This option ignores the RL-GO regions when calculating
the MoM currents.Tip: Where the MoM and RL-GO regions are electrically far apart and far field quantities are of interest, decouple the solution to reduce the memory and run-time without sacrificing the accuracy of the results.
- Maximum number of ray interactions
- This option limits the number of ray interactions (reflection and diffraction combined). For example, if this parameter is set to 3, a ray can have three reflections, or two reflections and a transmission. If left empty, then the maximum number if ray interactions is determined automatically.
- Edge and wedge diffractions
- This option takes into account the diffraction on edges and wedges.
- Export ray file for post-processing
- This option exports the rays during the RL-GO solution
process to a .ray file. The ray-tracing
information is also stored in the .bof
and you can view the rays in POSTFEKO.Note: Large .ray files are possible when the MoM and RL-GO solution have not been decoupled and the MoM region contains a large number of mesh elements.
- Adaptive ray launching settings
- This option allows you to control the density of the rays launched, as well as when to
stop tracing a ray based on the ray's decay.
- High (more rays): The ray density is high. Results take longer to obtain but with higher accuracy.
- Normal (default): The default ray density setting.
- Low (fewer rays): The ray density is low. Results are fast to
obtain but with lower accuracy.Note: Start with Low (fewer rays) which uses the least computational resources. When the model appears to be performing as expected, use a higher setting.
- Fixed grid increments
- This option allows you to specify the ϕ and θ angular resolution for ray launching and the increments for the
parallel ray front in the U direction and V direction. Though the run-time for a problem involving RL-GO may be decreased using this option, it may influence the
accuracy of the solution.Note: Manual specification of the angular increment should only be used under specific conditions after the implications have been carefully considered.