Hello, i'm a student and I'm doing a project and I'm looking how to take into account the interaction between a structure and an antenna ?

First I tried to import a STEP file, this is my fist problem because it's doesn't work on the student version, is there a possiility to import it or to modify it ? Should I launch the professional version instead?

Then I'm looking to take a quadrifilar antenna but there is no antenna like this with a dielectric, Is someone know how i can find it? even on the community page of Antenna Magus I can't find a such antenna (even a deca filar).

Then I would want to simulate this Antenna with the stucture, I think it's possible ...

Thanks for your future help, I'm struggling a little bit on this software .

CST Studio Suite ​​​​​​​