RF Engineer Interview Questions UK: 8 Real Questions and What Interviewers Want

Most RF Engineer interviews in the UK follow a pattern, and knowing it beats guessing. Below are eight questions from our bank of 12, each with a note on what the interviewer is really after.

Eight RF Engineer interview questions, and what the interviewer is thinking

1. What attracted you to RF engineering, and what does the day-to-day work involve?

Why they ask: They want to see you understand how specialised and measurement-heavy the role is.

2. Walk me through how you would produce a link budget for a wireless product, and what margins you would include.

Why they ask: A link budget is the foundation of RF system design and shows whether you can predict range.

3. What do S-parameters, return loss and VSWR tell you, and how would you match an amplifier input to 50 ohms?

Why they ask: Matching and measurement fundamentals appear in nearly every RF role.

4. Explain noise figure, the Friis cascade equation and the significance of P1dB and IP3 in receiver design.

Why they ask: Receiver performance questions separate those with real RF hardware experience.

5. What are the main layout considerations when putting RF circuitry on a PCB?

Why they ask: RF performance often succeeds or fails at layout, so they want practical knowledge.

6. What do you need to do to place a short-range radio product on the UK market legally?

Why they ask: Regulatory compliance is essential, and mistakes can stop a launch.

7. Field trials show your product's range is about 6 dB worse than your link budget predicted. How do you find out why?

Why they ask: They want to see structured troubleshooting that goes back to measurement.

8. Tell me about an RF design or measurement problem you solved, and how you proved the fix worked.

Why they ask: They want evidence of practical RF problem-solving with measurable results.

A sample answer to question 1

What attracted you to RF engineering, and what does the day-to-day work involve?

RF work appeals to me because it's a discipline where intuition has to be backed by careful measurement. Components behave differently at high frequency: a track becomes a transmission line, a via becomes an inductor, and layout is part of the circuit. A typical week for an RF engineer involves link budget and architecture studies, simulation in tools such as Keysight ADS or AWR Microwave Office, schematic and layout reviews, then bench work with a vector network analyser, spectrum analyser and signal generator to verify performance against the specification. There is also regular work with antenna and mechanical colleagues, and with test houses for regulatory approval. I enjoy that mix of analysis and hands-on debugging, and the fact that a small change, such as moving a matching component by a millimetre, can transform the result. It demands patience and good record-keeping.

Common mistake to avoid: Giving a generic wireless enthusiasm answer; Overlooking measurement work

Want the rest?

Full model answers, key points and common mistakes for all 12 questions are on the RF Engineer interview questions page. The first five are free, no sign-up needed.