This is a file from the Wikimedia Commons

File:Dipole antenna standing waves animation 461x217x150ms.gif

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

Dipole_antenna_standing_waves_animation_461x217x150ms.gif(461 × 217 pixels, file size: 88 KB, MIME type: image/gif, looped, 16 frames, 2.4 s)

Summary

Description
English: Animation showing standing waves on a half-wave dipole antenna driven by a sinusoidal voltage VO 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. The waves are shown graphically by bars of color (red for voltage V and blue for current I) whose width at each point is proportional to the amplitude of the wave at that point. There are voltage antinodes (maxima) and current nodes (zero points) at each end, while there is a voltage node and current antinode at the drive point in the center. The large oscillating voltages and currents on the antenna at resonance causes it to radiate maximum radio wave power.
Date
Source Own work
Author Chetvorno

Licensing

I, the copyright holder of this work, hereby publish it under the following license:
Creative Commons CC-Zero This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication.
The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current11:00, 6 June 2015Thumbnail for version as of 11:00, 6 June 2015461 × 217 (88 KB)ChetvornoUser created page with UploadWizard
The following pages on the English Wikipedia use this file (pages on other projects are not listed):

Global file usage

The following other wikis use this file:

Metadata