Lecture3

Interactionbetweenthesenew linesandtheclosedloops

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Unformatted text preview: f Electromagnetic Generation of Electromagnetic Radiation Voltage builds in the opposite direction Lines of force reform Interaction between these new lines and the closed loops results in the repulsion of the loops away from the antenna at speed of light + ­ Formation of Electric and Magnetic Formation of Electric and Magnetic Fields around an Antenna E­line e­ e­ Mag field e­ Electric Field | Magnetic Field Formation of Electric and Magnetic Formation of Electric and Magnetic Fields around an Antenna Formation of Electric and Magnetic Formation of Electric and Magnetic Fields around an Antenna Elementary dipole antenna is the basic radiating element of electromagnetic energy Constantly changing electric field Constantly changing magnetic field Formation of Electric and Magnetic Formation of Electric and Magnetic Fields around an Antenna Because of repulsion between lines of force in same direction, the alternating fields produced are propagated out into space as electromagnetic waves Horizontal / Vertical Horizontal / Vertical Polarization Antenna orientation is important! Dipole antenna radiates its energy in all directions perpendicular to its axis Transmitting and receiving antennas should be oriented alike Circular Polarization Circular Polarization Circular Polarization Circular Polarization Electric field rotates as it travels Used in satellite communications because it eliminates the need to try...
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