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HFSS air box

 
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puionte



Joined: 28 Aug 2007
Posts: 16
Post08 May 2008 10:32   HFSS air box
Hello,
I have set up an air box around my antenna and defined it as a radiation boundary. The box is distanced at a bit more than a quarter of the free space wavelength of the cenetr frequency from every side of the antenna (except the feeding side). The trouble is that when I increase the dimensions of the box, the antenna parameters (eg. S11) vary substantially.
Could anyoane please tell me how to choose the right dimensions for the box? Should I notice a convergence in the parameters around some box dimensions?

Thank you.
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Azulykit



Joined: 18 Feb 2007
Posts: 795
Helped: 100
Location: All over the Map.
Post08 May 2008 22:09   Re: HFSS air box
My first thought is that you may not be converged. Let it run more iterations. You may also need to increase the mesh on and in the airbox.
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zhangjun



Joined: 01 Apr 2008
Posts: 10
Post11 May 2008 4:46   HFSS air box
hfss v11 may tell you if your solution convergence or not
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ghb



Joined: 15 Jul 2002
Posts: 82
Helped: 5
Post14 May 2008 16:14   Re: HFSS air box
i would suggest using pml boundary for radiation problems, especially where radiation pattern accuracy or field calculations are needed to be accurate. this is suggested by ansoft.

see attachement.

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puionte



Joined: 28 Aug 2007
Posts: 16
Post15 May 2008 17:32   Re: HFSS air box
yes, I think it's a convergence problem, i've put a finer mesh and now the variations are barely visible.
Thank you
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