[SI-LIST] Re: Different Simulation Results
- From: steve weir <weirsi@xxxxxxxxxx>
- To: "Ing. Giancarlo Guida" <gianguida@xxxxxxxx>
- Date: Wed, 17 Mar 2010 06:49:43 -0700
If the HFSS insertion loss is high I suspect something like shorting the
signals to the imaginary ground bounding box or failure to establish a
ground plane. At any rate a sanity check s/b run on simple known
structures to make sure the tool is understood and under control.
Steve,
Ing. Giancarlo Guida wrote:
> Hi folks,
> I seriously doubt that software like HFSS and SI wave can make a mistake
> simulating a simple configuration like two coupled parallel microstrip
> lines.
>
> I would suspect that one of the model have something wrong; I bet that
> any Ansoft AE could easily help on this.
>
> By the way, with HFSS it is possible to simulate a transmission line
> structure of an arbitrary length by modeling a little piece and using
> the deembedding feature, provided that the structure is uniform.
>
> Regards
> Giancarlo
>
>
>
>
> Istvan Novak ha scritto:
>
>> At what frequency do you see this difference, and was the length the
>> same in the two simulators? In SiWave you can easily simulate very
>> long traces, whereas in HFSS your maximum length might be just a few
>> hundred mils.
>>
>> Regards,
>>
>> Istvan Novak
>> Oracle
>>
>>
>> Mohamad Haghtalab wrote:
>>
>>
>>> Hi all
>>>
>>> I've simulated two coupled parallel microstrip lines with both HFSS and
>>> SIwave(from
>>>
>>> Ansoft), there is good agreement between the SHAPE of Scattering Matrix
>>> results in two
>>>
>>> softwares,BUT in the LEVEL of them there is about 15 - 20 dB
>>> difference,what do you
>>>
>>> think about this?
>>>
>>> Regards
>>>
>>>
>>>
>>>
>>>
>>>
>>>
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>
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--
Steve Weir
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