CST - How to Design a Co-axial Power Coupler for RF Cavity?

Greetings,

I am looking for sample designs already available in CST Studio Suite or instruction guides for designing a co-axial power coupler in Tesla RF cavities. So far, I could not find anything, and I am very new in this field, so my knowledge is limited. I will gladly accept any instruction materials for this purpose from the respected members.

Forgive me if this is a very odd or straightforward question, but I need to learn it and apply that in CST.