Mathur A , Trivedi R Antenna And Wave Propagation 2011 | 17.69 MB

Title: Prelims.p65
Author: swyam

Description:
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.

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