It was just one interview where he asked me some technical questions about RF concepts such as VSWR, Maxwell Equations, etc. that they taught us in school, so you should be able to answer them.

I was scheduled for a phone interview with the recruiter. During the phone interview, the recruiter mentioned that I was going through the next round and just wanted to ask some questions as a formality. The next week, I was scheduled for an interview with the hiring manager and another team member. There was no technical questions and they mostly went over which courses I have taken in college and some projects I did. They focused on asking what skills I had that were related to RF. It was mostly conversational. Was told that I would have a decision in the coming weeks, but never heard back. I followed up with the recruiter a couple of times and they never got back.