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An antenna is an essential component in radio communication systems that facilitates the transfer of information from a transmitter to a receiver through the propagation of electromagnetic waves. The antenna operates based on the basic principles of electromagnetic wave propagation, which is determined by the E-field and H-field components of the wave.
The E-field or electric field is a measure of the strength and direction of the electric force that exists between two charged particles. In an antenna, the E-field is responsible for the creation and emission of the electromagnetic wave. For instance, when a voltage is applied to the antenna, it creates an oscillating electric current that flows along the length of the antenna, generating an E-field that radiates outward.