Rules | Recent posts | topic RSS | Search | Register  | Log in

HFSS air box

 
Post new topic  Reply to topic    EDAboard.com Forum Index -> Electromagnetic Design and Simulation
Author Message
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.
Back to top
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.
Back to top
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
Back to top
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.



Sorry, but you need login in to view this attachment

Back to top
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
Back to top
Post new topic  Reply to topic    EDAboard.com Forum Index -> Electromagnetic Design and Simulation
Page 1 of 1 All times are GMT + 1 Hour


Abuse
Administrator
Moderators
topic RSS 
sitemap