Had a phone call with hr and then with the potential supervisor. It wasn't that hard. They expect both hardware and software skills. They want you to explain what you have done so far.
HR phone screen one day, technical the next. I failed the technical, it was very tough. The interviewer will ask a lot of theoretical questions, so brush up on your fundamentals.
Interview questions [1]
Question 1
how to get two dipoles to be circularly polarized
is power a physical contribution to free space path loss