Definitions of Antenna

The basic definition of an antenna is a metallic device in the form of either wire or rod used for radiating or receiving radio waves. An antenna serves as a structure providing a transition between a guiding device and free space and vice versa.

According to IEEE standard definitions of terms for antennas, an antenna or aerial is a means for radiating or receiving radio waves.

As discussed in previous section, antenna produces electromagnetic fields and these fields constitute an electromagnetic wave. Thus antenna can be defined as source or radiator of electromagnetic waves. An antenna can be used to sense an electromagnetic wave. Hence it can be defined as a sensor of electromagnetic waves.

An antenna can also be defined as a transducer which converts radio frequency electrical current into an electromagnetic wave of the same frequency as that or an electrical current. An antenna acts as a coupling device between a generator or transmitter and tree space. In other words, an antenna is an impedance matching device between free space and transmission line.


An antenna is a device that is used to transmit or receive electromagnetic waves. It is a transducer that converts electrical signals into electromagnetic waves and vice versa. Antennas are commonly used in radio and communication systems, radar systems, and wireless networks.

There are many different types of antennas, including dipole antennas, patch antennas, helical antennas, yagi antennas, and parabolic antennas. Each type of antenna is designed for a specific purpose and has its own unique characteristics and performance.

Antennas can be designed for specific frequency ranges and polarization orientations, and their radiation patterns can be tailored to meet specific requirements. They can also be designed for specific applications, such as directional antennas for point-to-point communication, omnidirectional antennas for broadcasting, or stealth antennas for low observability.