FreeLists / si-list / [SI-LIST] Re: A question in 2D Extractor & HFSS

["giancarlo guida" <gguida@xxxxxxxxxx>]

Hi Samuel,
the way to define excitation in 2D extractor and in HFSS is quite different
because the first use a quasi-static approach while the second use a
full-wave method.

In HFSS the user need to assign a port
on which the propagating mode is calculated.
(TEM in case of the microstrip)
HFSS will also calculate port impedance, guided wavelenght and effective
permittivity
and will take automatically in account all the losses if present.

As you know there are several way to calculate the impedance associated to
a propagating mode: Zpi,Zpv,Zvi
HFSS uses Zpi by default but for aTEM mode
Zvi could be more natural choise.

The user can ask HFSS to use any of the 3 impedance definition to calculate
characteristic impedance; in any case for a 50 ohm line , just to make an
example)
all the 3 impedance will be really close to 50 ohm.

I hope this help,
in any case you may want contact an Ansoft AE of  your area
 to get more detailed answer on your question

Regards
Giancarlo
----- Original Message -----
From: <yf_xie@xxxxxxxxxx>
To: <si-list@xxxxxxxxxxxxx>
Sent: Wednesday, July 14, 2004 3:01 AM
Subject: [SI-LIST] A question in 2D Extractor & HFSS







   Hi All,

   I  met  a  problem in HFSS. As before when using Maxwell 2D Extractor to
   simulate  microstrips,  I only care about the Characteristic Impedance >
   Lossy Z0. And it is easy to get this value.
   Now  turns  to HFSS, I cannot find Lossy/Lossless Z0 but found Zpi, Zpv,
   and Zvi impedance. How can I do?


   Samuel




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