Electronics > Beginners
Is this material correct? EMC Radiation
(1/1)
Simon:
So attached is a lesson from my current module. I am confused, pages 9 and 14 talk about electric fields in the short conductor and magnetic fields in the loop conductor.

So the first thing that confuses me is that it talks about there fields being "stronger than the plane wave". I thought the plane wave was made up of both so they are saying that the field is stronger than itself?

I also think they have got the names back to front or the ratios with which the fields reduce as when the electric field reduce by one over the cube of the distance and the magnetic field reduces by one over the square of the distance they call it an electric field and vice versa when it is the other field that prevails in the near feild range.
Zero999:
I can't remember the exact maths, but in he near field region, whether the electric or magnetic field is stronger, depends on whether it's a rod or loop.

In the far field region, both the magnetic fields decay at the same rate, in accordance with inverse square law, so 1/d2 makes sense.
https://en.wikipedia.org/wiki/Inverse-square_law

In the near field region, the stronger field, whether it be magnetic, or electric, decays at a faster rate of 1/d3 and the weaker one decays at 1/d2.
Simon:
In the far field it's the inverse square law for the power. Individual fields are inversley proportional so their multiplied result that gives the power will decay to the square.
Navigation
Message Index
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod