Converts Electrons to Photons of EM energy It is a transducer which interfaces a circuit and freespaceĥ Only accelerated (or decelerated) charges radiate EM waves.Ī current with a time-harmonic variation (AC current) satisfies this requirement.Ħ The role of antennas Antennas serve four primary functions:
An antenna is a passive structure that serves as transition between a transmission line and air used to transmit and/or receive electromagnetic waves. Hertz ( ) First aerial propagation (German) Marconi ( ) Transatlantic transmission (Italian) DeForest (Triode tube 1920) Signal generators (American) World War II ( ) Intense war-driven developmentĤ What is an Antenna? An antenna is a way of converting the guided waves present in a waveguide, feeder cable or transmission line into radiating waves travelling in free space, or vice versa. Folded dipole, Yagi array.ģ Antenna Background Maxwell (1831-79) Fundamental equations. Matching – Baluns, Polarization mismatch, Antenna noise temperature, Radiation from oscillating dipole, Half wave dipole. In this page you may see antenna and wave propagation ppt related pages link And You're currently viewing a stripped down version of content.Definition of antenna parameters : Gain, Directivity, Effective aperture, Radiation Resistance, Band width, Beam width, Input Impedance.
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