Re: WiFi magnetic shielding? (Was: RFP for OpenEMS)

Hi Kingsley,

Are you trying to create a shield for static magnetic fields, or time variant magnetic fields?

If you want to shield from static magnetic fields, unfortunately the only thing you can use is Mu-Metal (https://en.wikipedia.org/wiki/Mu-metal), and it is expensive.

If you just want to shield from alternating magnetic fields, you can use any decent electric conductor (in sheet form) which will induce the eddy currents needed to stop penetration into your shielded environment. In the past I have seen Copper Clad Plywood used to great effect to build shielded rooms. You would have to buy the copper sheet metal and plywood separately and glue them together. The joints need to be sealed with copper tape. The thickness of copper required depends on the frequencies of interest that you are trying to block (https://en.wikipedia.org/wiki/Skin_effect).

Cheers,

Silas

On Sat, Aug 15, 2015 at 7:54 PM, Kingsley G. Morse Jr. <kingsley@loaner.com> wrote:

Hi Felipe,

I enjoyed learning of OpenEMS.

Thanks!

If you happen to know if it could help me design a
*magnetic* shield for WiFi frequency (2-5 GHz)
EMF, please let me know.

A chicken wire Faraday cage seems to shield
electric waves, but the magnetic ones slip through.

Thanks,
Kingsley

On 08/14/15 16:10, Felipe BM wrote:
> Hi All,
>
> I'm a professor of computational electromagnetics and recently I've been
> using OpenEMS on my classes and my reasearch with very good results.
> OpenEMS is a simulation package that runs under Octave/Matlab and its based
> on the Finite Difference Time Domain (FDTD) method.
>
> Although there are a similar packages available on the Debian Repositories
> (i.e. Meep or Tessa), I prefer to use OpenEMS due to its Matlab syntax,
> which reduces the learning curve for most my students. Also OpenEMS is well
> documented and it is in active development.
>
> That's why I'm asking for your help to pack this excellent software. I'm
> decided to learn and help during this process, although I'm totally
> ignorant about the Debian packaging process.
>
> cheers,
> Felipe.
>
> More info:
>
> www.openems.de
>
> To install it on a debian machine:
>
> Prerequisites:
>
> sudo apt-get install build-essential git libhdf5-dev libvtk5-dev
> libboost-all-dev libcgal-dev libtinyxml-dev libqt4-dev libvtk5-qt4-dev
>
> Install:
> git clone -b stable https://github.com/thliebig/openEMS-Project.gitcd
> openEMS-Project
> ./update_openEMS.sh ~/opt/openEMS

--
Time is the fire in which we all burn.

"fork() is the UNIX programmer's hammer. Because it's available, every problem looks like a nail."