Radiation Box?

Altair Forum User

Hello,

 

I am new to FEKO.

 

In HFSS you are required to place a radiation box around your structure. Does a similar radiation/air box need to be placed in FEKO? I see no mention of this anywhere in the documentation except for the dielectric radiator antenna example where an layer of air was added for the FEM/MOM method. I have created a unit cell that I will be performing an infinite array analysis on and eventually a finite array analysis (using the default domain decomposition).

 

Thanks

 

Altair Forum User

Hi Jason,

 

Depending on the underlying solution technique, a volume mesh may be necessary.  For FEM and FDTD, fields are calculated inside the mesh elements.  However, when you use any of the other techniques (including MoM) then fields can be calculated at arbitrary positions in space.  In other words, you only need to add an air box (or set the boundary conditions) when you use FEM or FDTD.  FEKO is very good ad hybridising the different solver techniques, which allows a FEM region to transfer energy to a MoM environment and vice versa.

 

The Examples Guide has two relevant examples that you can look at, namely:

• A-16 Periodic boundary conditions for array analysis
• A-17 Finite array with non-linear element spacing

In both examples, you don't need to add an air box because the solution techniques doesn't require it.

 

I hope that helps!

Regards,

Andries

Altair Forum User

Thanks for the explanation.  I think I got this part figured out.