Radio frequency (RF) refers to the rate of oscillation of electromagnetic radio waves in the range of 3 kHz to 300 GHz, as well as the alternating currents carrying the radio signals. In simpler terms a radio wave is an electromagnetic wave propagated by an antenna which is used for communication.

This RF Engineering course covers in detail

RF Basics - Transmitters and Receivers, Analog Signals, Frequency, Digital Signals
RF Behaviour - Loss and Gain, Insertion Loss, Skin Effect, Free Space Loss, Reflection
Basic System Components Part I - Transmitters and Receivers, Antennas
Basic System Components Part II - Amplifiers, Fundamental Properties of an Amplifier, Special Amplifiers, Filters, Special Filters, Mixers, Sources
Circuits and Signals - Semiconductors, Diodes and Transistors, Integrated Circuits (MMIC)
Circuit Technologies - Lumped and Distributed Circuits, Discrete, Hybrid, and MMIC Circuit Technology, Subassemblies, Cavities
Modulation - Introduction, Types of Modulation, Modulators and Demodulators
Other Components Part I - RF Adapters, ADC, Attenuators, Capacitors
Other Components Part II - Charging and Discharging of Capacitors, Stray Capacitance, Capacitors in Parallel, Capacitors in Series, Alternating Current in a Capacitor, Capacitive Reactance, Quality Factor
Other Components Part III - RF Chokes, RF Circulators, RF Connectors, RF Couplers
Other Components Part IV - Crystal Oscillators, DC Blocks, RF Delay Lines, RF Detectors, RF Diplexer
Other Components Part V - Frequency Doublers, RF Front End Modules, Hybrid Couplers, Impedance Matching Pads, RF Inductors, RF Isolators, RF Limiters, RF Mixers, Frequency Multipliers
Other Components Part VI - Phase Shifters, Power Dividers, RF Switch, RF Terminations, RF Transistors, VCO, Wireless Charging Receiver IC, Wireless Charging Transmitter IC
RF Filters - Introduction, Passive Filters, Active Filters, Key Parameters to Describe Filter Response