[SI-LIST] Re: HFSS vs. CST

Hi again

I should have pointed out we are using CST Microwave Studio Transient (this
is time domain, but also gives frequency domain s-parameters).  The
Transient Solver has the PBA facility and seems like the better choice for
broad-band problems like interconnects, including PCBs and packages.
Apparently the tetrahedral option is available only in the Frequency Solver
option.

> -----Original Message-----
> From: Geoff Stokes 
> Sent: 12 May 2004 09:42
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: HFSS vs. CST
> 
> 
> Hi
> 
> Using CST Microwave Studio - haven't tried HFSS.
> CST Microwave Studio v 5 can switch between cartesian 
> (rectangular) grid and
> tetrahedral (triangular?).  We haven't tried tetrahedral yet, 
> but the PBA is
> supposed to fit to curved surfaces.  See
> 
> http://www.cst.de/Content/Company/Documents/mwjournal_Jan_2004.pdf
> 
> and also the rest of their site.
> 
> It seems quite fast without losses, but very slow when losses 
> are included.
> To get well-converging results, it seemed to need a mesh 
> ratio of 50 rather
> than the default of 10.  This actually speeds things up when 
> parts of the
> box volume don't need the finer mesh detail.  Any other findings?
> 
> Cheers
> Geoff
> 
> > -----Original Message-----
> > From: Thomas Beneken [mailto:beneken@xxxxxxxxxxxx]
> > Sent: 12 May 2004 09:29
> > To: si-list@xxxxxxxxxxxxx
> > Subject: [SI-LIST] Re: HFSS vs. CST
> > 
> > 
> > Merrick,
> > 
> > I've been in the same situation to evaluate HFSS and CST 
> for connector
> > design. Both will do the job but there are differences in principle.
> > 
> > HFSS delivers primary data like a VNA will do - CST offers 
> > TDR-like data.
> > Both can convert their data into the other domain.
> > 
> > HFSS does a very adaptive triangular meshing - CST mesh is 
> > rectangular.
> > 
> > With HFSS there is a chance to miss something interesting 
> > stepping through
> > frequencies.
> > CST may have a problem with high-Q situations: you have to 
> > wait until all of
> > the input pulses energy returns. (Not really a problem with 
> > connectors.)
> > 
> > Poor meshing gives bad results with both of them. For me it's 
> > easier to
> > indentify meshing problems in CSTs reflection results.
> > 
> > HFSS can deal with frequency dependend material properties 
> > more easyly than
> > CST.
> > There are differences with dielectric and conductive surfaces too.
> > 
> > My 2 cents.
> > 
> > Thomas
> > 
> > > -----Original Message-----
> > > > >    Date: Tue, 11 May 2004 14:50:54 -0500
> > > > >    From: "Moeller, Merrick" <mmoeller@xxxxxxxxxxxxxxx>
> > > > > Subject: HFSS vs. CST
> > > > >
> > > > > Experts,
> > > > >       Are there any benchmarks that compare the 
> > performance between
> > > > > HFSS and CST available?
> > > > >       In going from a frequency domain solver to a 
> > time domain solver
> > > > > and vise versa what are the trade offs?
> > > > >       Is accuracy of the HFSS and CST at the same level?
> > > > >       Is there any type of problem that will not be 
> > accurate with one
> > > > > or the other?
> > > > > Regards,
> > > > > Merrick
> > 
> > 
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> 
> 
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> 
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> 
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> AcoustarTM ZXCW8100 End-to-End Digital Audio Amplifier Controller
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Zetex Semiconductors - Solutions for an analog world

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AcoustarTM ZXCW8100 End-to-End Digital Audio Amplifier Controller

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