Lecture3

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Unformatted text preview: Pilot Training 101 Generation of Electromagnetic Generation of Electromagnetic Radiation Elementary dipole antenna – Linear arrangement of a conducting material – Dipole subjected to alternating electrical force Results in electromagnetic radiation – Half­wave dipole antenna length is λ/2 Generation of Electromagnetic Generation of Electromagnetic Radiation + + + + ­ ­ ­ ­ a b c = Alternating Current Source d Generation of Electromagnetic Generation of Electromagnetic Radiation + ­ An electric field is generated in the plane of a conductor Maximum intensity at instant of maximum voltage The associated lines of electric force are illustrated Outer lines are bowed away from inner ones due to natural repulsion between lines of force in the same direction Generation of Electromagnetic Generation of Electromagnetic Radiation The voltage has now dropped Force lines collapse when the voltage difference between ends reduces As the voltage drops, the lines of force move closer to the center of the dipole + ­ Generation of Electromagnetic Generation of Electromagnetic Radiation The outermost lines do not collapse, and double on themselves to form a closed loop At this instant, the voltage is zero Voltage begins to build in the opposite direction + ­ Generation o...
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