Which field is primarily associated with the radiation of energy from an antenna?

Which field is primarily associated with the radiation of energy from an antenna?

• A. Induction
• B. Radiation
• C. Propagation
• D. Reflection

Answer: (B)

Radiation is the process of energy being emitted from the antenna as electromagnetic waves into space. When the current in an antenna changes with time, it creates changing electric and magnetic fields that carry energy away as EM waves. Induction describes energy transfer through magnetic coupling, not the act of emitting energy into free space. Propagation refers to the way those waves travel through space once they’re radiated, and reflection is the bouncing of waves off surfaces. So the field most closely describing the energy emitted by an antenna is radiation.

Radiation is the process of energy being emitted from the antenna as electromagnetic waves into space. When the current in an antenna changes with time, it creates changing electric and magnetic fields that carry energy away as EM waves. Induction describes energy transfer through magnetic coupling, not the act of emitting energy into free space. Propagation refers to the way those waves travel through space once they’re radiated, and reflection is the bouncing of waves off surfaces. So the field most closely describing the energy emitted by an antenna is radiation.