Basics were tested in Noise, Distortion, Antenna theory were tested. Few areas include RF fundamentals: Concepts such as impedance matching, transmission lines, Smith chart, RF filters, RF amplifiers, mixers, oscillators, and antennas.
RF circuit design: S-parameters, noise figure, gain, stability, and linearity.
RF measurement techniques: Use of network analyzers, spectrum analyzers, vector signal analyzers, and other RF test equipment.
RF system design: Link budget analysis, modulation techniques, frequency planning, and interference analysis.