Which component is used to radiate and collect radio frequency waves in aircraft communications?

• A. Antenna
• B. Transmitter
• C. Receiver
• D. Waveguide

Answer: (A)

Radiating and collecting radio frequency energy in aircraft communications is done by the antenna. The antenna’s job is to convert electrical power from the transmitter into electromagnetic waves that travel through the air (radiation) and, in reverse, to convert the incoming RF waves back into electrical signals for the receiver to process. The transmitter itself creates and sends the signal, but the actual radiating is performed by the antenna. The receiver amplifies and interprets the electrical signal picked up by the antenna, not by the airwave itself. A waveguide, meanwhile, simply guides RF energy between components and does not radiate or receive on its own.