Dipole_antenna_standing_waves_animation_3-10fps.gif (512 × 237 pixels, file size: 145 KB, MIME type: image/gif, looped, 20 frames, 2.0 s)
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Summary
DescriptionDipole antenna standing waves animation 3-10fps.gif |
English: Animation showing standing waves on a half-wave dipole antenna driven by a sinusoidal voltage Vi from a radio transmitter at its resonant frequency. The oscillating voltage pushes the electrons back and forth along the two metal rods that make up the antenna, creating oscillating currents (blue arrows) in the antenna, charging its ends alternately positive (+) and negative (-). Since at this frequency the antenna is a half wavelength (λ/2) long, a sinusoidal wave of voltage or current takes exactly one cycle to make the round trip from one end of the antenna to the other and back, so the reflected waves reinforce each other. The antenna acts like an electronic resonater. Waves of current and voltage reflecting back and forth between the ends of the rods interfere to form standing waves, which radiate radio waves into space. The waves are shown graphically by bars of color (red for voltage V(x) and blue for current I(x)) whose width at each point is proportional to the amplitude of the wave at that point. This image differs from my previous animation Dipole antenna standing waves animation 1-10fps.gif and most graphs of the standing waves shown in antenna textbooks in that it shows the effect of the driving voltage on the standing waves. The transmission line applies a voltage |
Date | |
Source | Own work |
Author | Chetvorno |
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Captions
Animation showing standing waves of current and voltage on a dipole antenna
Items portrayed in this file
depicts
8 July 2020
File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 05:46, 9 July 2020 | ![]() | 512 × 237 (145 KB) | Chetvorno | Uploaded own work with UploadWizard |
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GIF file comment | PhotoScape |
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