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mhaghaed
Joined: 31 Mar 2009
Posts: 7
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 04 Nov 2009 6:13 HFSS giving wrong solutions half the time |
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| I've used hfss to simulate an on-chip inductive coupling link at 433MHz. Everything was perfect and the results were close to the values I got from ASITIC. I saved separation as a design parameter and changed that from 1cm-10cm accordingly and everything looked fine in 3D view.However, when I changed the coil separation from 1cm to 10cm, it gave me a wrong answer with negative resistance and mH(!) inductance values. Can anyone tell me if he has similar experience
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Abhishekabs
Joined: 12 Jan 2007
Posts: 727
Helped: 84
Location: India
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04 Nov 2009 6:27 HFSS giving wrong solutions half the time |
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What are you getting for seperation of 2cm, 5cm ?
How much deviation is there?
Need to check step by step.
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mhaghaed
Joined: 31 Mar 2009
Posts: 7
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04 Nov 2009 8:12 Re: HFSS giving wrong solutions half the time |
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with an airvolume width of 2cm:
separation = 0.5cm ->OK
separation = 1.5cm ->OK
separation = 4.5cm ->Does not even simulate, it encounters some problem while meshing and says it might be because of skewed thin surfaces
Increasing airvolume width to 1meter does not help at all
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Abhishekabs
Joined: 12 Jan 2007
Posts: 727
Helped: 84
Location: India
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04 Nov 2009 9:25 Re: HFSS giving wrong solutions half the time |
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Can you upload the project.
so that we can check.
Without understanding project it will not be correct to comment on error.
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mhaghaed
Joined: 31 Mar 2009
Posts: 7
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05 Nov 2009 2:03 Re: HFSS giving wrong solutions half the time |
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OK, now it doesn't simulate at all. Can you tell me how I can overcome the following:
"Surface Recovery failure Possible reasons : (1) . model has multiple objects with thin layers (2) complex model with object overlapping (3)" True surfaces are skewed "
Hassan
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Abhishekabs
Joined: 12 Jan 2007
Posts: 727
Helped: 84
Location: India
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05 Nov 2009 5:44 HFSS giving wrong solutions half the time |
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This sounds like geometry fault,
How you are changing your width or spacing?
I dont know how your geometry looks like, but I think you have not created geometry with proper operations such as subtraction or uniting objects etc.
Try creating the geometry by different method and simulate.
Best of luck.
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mhaghaed
Joined: 31 Mar 2009
Posts: 7
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06 Nov 2009 6:56 Re: HFSS giving wrong solutions half the time |
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My geometry consists of two thin-sheet coils(mm-sized) buried in dielectrics that are separated far from each other(1cm+).
I tried specifying some mesh operations to help it in meshing the structure, but it still gave me the same error.
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Abhishekabs
Joined: 12 Jan 2007
Posts: 727
Helped: 84
Location: India
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06 Nov 2009 7:30 Re: HFSS giving wrong solutions half the time |
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Please email me your file, I will try to find out.
BR,
Abhishek
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