nf2ff plane placement

How to use openEMS. Discussion on examples, tutorials etc

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linuxmill
Posts: 10
Joined: Tue 10 Apr 2012, 22:14

nf2ff plane placement

Post by linuxmill » Fri 13 Apr 2012, 07:11

Another question:

placement of nf2ff planes:
Is there an ideal location in the mesh for them? eg, do they need to be 10 cells in from the boundary?
Is there an ideal geometric location for them in relation to the radiator/emitter?
Basically, I want to know how to place them properly so that they are predictive.

Thanks,
Jim

thorsten
Posts: 1438
Joined: Mon 27 Jun 2011, 12:26

Re: nf2ff plane placement

Post by thorsten » Fri 13 Apr 2012, 07:21

Hi Jim,

this is easy to answer :)

They have to be as far away from a radiating structure as possible, but something like lambda/4 is a good idea.

At the same time you of course need to use absorbing boundary conditions (e.g Mur or better PML) to mimic free space around your antenna.
And the nf2ff box has to stay on top (inside) of these boundary conditions. A pml usually uses 8 cells (MUR only 1). So staying 10 cells away from the mesh boundaries is a good idea. If it would only be e.g. 4 cells you would be right inside the PML boundary conditions making the nf2ff useless.

regards
Thorsten

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