Dipole_receiving_antenna_animation_6_800x394x150ms.gif
Summary
Description Dipole receiving antenna animation 6 800x394x150ms.gif |
English:
Animation showing a half-wave
dipole antenna
receiving power from a
radio wave
. The antenna consists of two metal rods each one-quarter of the
wavelength
long, attached through a parallel transmission line to a resistance
R
equal to the
characteristic impedance
of the antenna, representing the receiver. The electromagnetic wave is represented by its
electric field
(
E, green arrows
)
(it should be kept in mind that the drawing only shows the field along one line, while the radio wave is actually a plane wave and the electric field is actually the same at every point on a plane perpendicular to the direction of motion). The wave's magnetic field is not shown.
The oscillating electric field exerts force on the electrons in the antenna rods , causing them to move back and forth in currents (black arrows) between the ends of the antenna rods, charging the ends of the antenna alternately positive (+) and negative (−) . Since the antenna is a half-wavelength long at the radio wave's frequency, it excites standing waves of voltage ( V, red ) and current in the antenna. The voltage along the antenna elements is represented graphically by a band of red whose thickness at any point is proportional to the magnitude of the voltage. The oscillating currents flowing back and forth from one antenna element to the other, pass down the transmission line and through the radio receiver, represented by R . In this animation the action is shown slowed down drastically; the radio waves received by dipoles actually oscillate back and forth at tens of thousands to billions of cycles per second. |
Date | |
Source | Own work |
Author | Chetvorno |
Other versions |
Dipole receiving antenna animation 2 800x403x15ms.gif
- more wide view
|
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Licensing
I, the copyright holder of this work, hereby publish it under the following license:
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.
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