What do electric and magnetic fields look like around a dipole antenna?

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Discussion Overview

The discussion revolves around understanding the electric and magnetic fields around a dipole antenna, particularly in the context of Maxwell's equations. Participants explore the expected field directions at varying distances from the antenna and seek resources for better visualization of these fields.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant is studying Maxwell's equations and seeks to understand the electric and magnetic fields around a dipole antenna, including their expected directions at a distance d.
  • There is a query about the expected visual representation of fields from two identical antennas, one nearby and another 6 km away.
  • Some participants express a need for additional resources, such as videos or detailed texts, to visualize the fields better.
  • One participant suggests that the field lines are not curved when considered over the dimensions of a typical antenna at a great distance.
  • Another participant references Hertz's work on field lines and mentions that it is reproduced in a book by J D Kraus, while expressing uncertainty about the accuracy of the visual representations of induction fields close to the antenna.

Areas of Agreement / Disagreement

Participants express a shared interest in the topic, but there is no consensus on the specific visualizations or the accuracy of existing representations of the fields around the antenna.

Contextual Notes

Participants note limitations in available references and the challenge of accurately depicting induction fields near the antenna, indicating potential gaps in understanding or representation.

Nate Duong
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I am studying to about maxwell's equations on the electric and magnetic field.

First of all, just do the example and exercise: https://www.princeton.edu/ssp/josep...ide-to-maxwells-equations-D.-FleischLEISC.pdf

I have this dipole antenna: http://www.universal-radio.com/catalog/hamantht/1204.html and trying to understand what are electric and magnetic field look like around dipole antenna? and what direction do I expect for the electric field to be in distance d? and if I have 2 same antennas, 1 is right next to me and another is 6km away, what do you expect to see the one in 6km away? I assume the distance between I and the dipole antenna is d.

If anyone has good video link or pdf link in detail what those fields look like, that would be nice, I would like to have more visualization by video or images.

Thank you.
 
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Does this help?

Felder_um_Dipol.jpg
 
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Drakkith said:
Does this help?

View attachment 196985

It is helped, but for the visualization.
Do you have any information (links, or book) in detail for this topic? if I have 2 same antennas, 1 is right next to me and another is 6km away what direction do I expect for the electric field to be in distance d? and what do you expect to see the one in 6km away?
 
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Sorry, I don't have any in-depth references for you. :frown:
 
Nate Duong said:
It is helped, but for the visualization.
Do you have any information (links, or book) in detail for this topic? if I have 2 same antennas, 1 is right next to me and another is 6km away what direction do I expect for the electric field to be in distance d? and what do you expect to see the one in 6km away?
I think they are getting at the idea that the lines are not curved when considered over the dimensions of a typical antenna at a great distance.
 
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tech99 said:
I think they are getting at the idea that the lines are not curved when considered over the dimensions of a typical antenna at a great distance.
As a matter of interest, Hertz published his idea of field lines in one of his papers, and they are reproduced in Antennas by J D Kraus. I am not certain that the pictures correctly show the induction fields close to the antenna.
 
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tech99 said:
As a matter of interest, Hertz published his idea of field lines in one of his papers, and they are reproduced in Antennas by J D Kraus. I am not certain that the pictures correctly show the induction fields close to the antenna.
Thank you for more information.
 

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