CST： How to generate different modes in dielectric resonators based antenna

Dear Members, Good day.

I have an elliptical shaped dielectric resonator (DR) antenna excited via a slot coupled microstrip line. It resonates between 5-7 GHz.
I would like to know in CST how can I;

1. Generate various modes (TE/TM/Quasi TEM) in the DR antenna.
2. See which modes are generated (TE01, TM01,TEM02 etc).
3. Modes generation via 2D E/H/Current graphs.

Looking forward to your replies,
Best Regards.

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