From what I could gather after a quick search on the internet, it would seem that any material can reflect or absorb RF waves but thickness matters. It's obvious that most parabolic dishes are made out of a metal so metals must be better at reflecting RF waves compared to other materials. My questions are:
- What physical effects are taking place here to produce a reflection? What type of compound would reflect RF waves the best?
- How much does smoothness or uniform thickness of the material affect its ability to reflect?
- What theories/equations help us predict the effects of these factors?
Edit: Originally I mentioned thinking about building a parabolic dish, but I removed that part since it's not really relevant to the question.