An antenna is basically a transducer. It converts radio frequency (RF) signal into an electromagnetic (EM) wave of the same frequency. It forms a part of transmitter as well as the receiver circuits. Its equivalent circuit is characterized by the presence of resistance, inductance, and capacitance. The current produces a magnetic field and a charge produces an electrostatic field. These two in turn create an induction field.

Definition of antenna

An antenna can be defined in the following different ways:

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An antenna may be a piece of conducting material in the form of a wire, rod or any other shape with excitation.

An antenna is a source or radiator of electromagnetic waves.

An antenna is a sensor of electromagnetic waves.

An antenna is a transducer.

An antenna is an impedance matching device.

An antenna is a coupler between a generator and space or vice-versa.