A conductor or a set of conductors used either to radiate electromagnetic energy into space or to collect this energy from space?

A conductor or a set of conductors used either to radiate electromagnetic energy into space or to collect this energy from space?

• A. Antenna
• B. Conductor
• C. Capacitor
• D. Resistor

Answer: (A)

Antennas are designed to interact with free-space electromagnetic fields. When driven by a radio source, the currents on the conductor produce electromagnetic waves that radiate into space; when waves arrive from space, they induce currents that the receiver can process. A general conductor isn’t inherently built to radiate or receive efficiently, a capacitor stores energy in an electric field, and a resistor converts energy to heat. So the device specifically built for emitting and/or receiving EM energy is the antenna.

Antennas are designed to interact with free-space electromagnetic fields. When driven by a radio source, the currents on the conductor produce electromagnetic waves that radiate into space; when waves arrive from space, they induce currents that the receiver can process. A general conductor isn’t inherently built to radiate or receive efficiently, a capacitor stores energy in an electric field, and a resistor converts energy to heat. So the device specifically built for emitting and/or receiving EM energy is the antenna.