CST Studio Suite 

Hi,

I would like to understand the difference between two states when using a rectangular horn waveguide antenna.

1. Enabling a Single Mode: If I set the "Number of modes" to, for example, 6 and enable only the "mode" option for mode 1, what happens? Does this mean that mode 1 excites all six modes, even though only mode 1 is explicitly enabled? I notice that I only see one far-field plot for mode 1.
2. Enabling All Modes: If I set the "Number of modes" to, for example, 6 and enable the "mode" option for all modes, what happens? Does this mean that each mode is excited individually, even if some of these modes are not naturally excited along the structure?

Thank you for your help.