I would like to know the precise formula for the Free Space Path Loss in case of a Magnetic Field in the Near Field region.

We all know the popular FSPL formula, but this is only for the far field, where we have planewaves.

enter image description here Source: https://en.wikipedia.org/wiki/Free-space_path_loss

I am looking for a near-field magnetic field path loss formula. How much strength does a magnetic field lose per distance from the source?

Is there any way to model this system. I could not find a formula on the entire internet, I was hoping somebody here would know.

  • \$\begingroup\$ In the near field we have to solve maxwell's equations to get anything sensible. \$\endgroup\$ – Joren Vaes May 13 '17 at 16:42
  • \$\begingroup\$ I recall the book Corsin and Lorrain have a page where they show the entire field ---- partA with range^2 atten and other partB with range^1 attenuation. Close in, the partA dominates. I'll hunt up the book, and look for that page. \$\endgroup\$ – analogsystemsrf May 13 '17 at 17:50
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    \$\begingroup\$ Check out the following link. grouper.ieee.org/groups/802/15/pub/04/… \$\endgroup\$ – MNSP May 13 '17 at 18:27
  • \$\begingroup\$ @MNSP Looks like the magnetic field strenght decays faster than the electric, which was my intuition as well. I will study it, thanks. \$\endgroup\$ – David K. May 13 '17 at 19:51

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