[SI-LIST] Ansoft HFSS - inductive xtalk setup 2

In additional to my previous posting, here is what I have tried.

1. Use wave port at both ends of the wires. I setup 2 ports, and each port
has 2 terminals. At each end/port, an arrow is drawn from the perimeter of
the air cylinder to the perimeter of each wire conductor. After the
S-parameter is calculated, I use Zload=Zo*(I+S)/(I-S) to calculate Zload. If
the imaginary part of Zload (Zload = R +jX) is positive, then L=X/(2*pi*f).
If the imaginary part of Zload is negative, then C = 1/(2*pi*f*X). However,
all the elements of Zload have negative imaginary part. Why??


2. Use wave port at one end and lump rlc port at the other end. This method
also gives all Zload elements with negative imaginary part (-X).

Can someone have any idea?? Thanks.

Tim

-----Original Message-----
From: Michael J. Degerstrom [mailto:degers@xxxxxxxxxxxxxxxxxxxx]
Sent: Tuesday, September 17, 2002 10:48 AM
To: TTSP (Timothy Pak); si-list@xxxxxxxxxxxxx
Subject: Re: [SI-LIST] Ansoft HFSS - inductive xtalk setup


Tim,

You should be able to use the wave port.  Check out their tutorial
"Getting Started: A full-wave SPICE problem" where their model is even a 
little more complicated than yours.

How do you know that you have negative inductance since hfss outputs 
s-parameters?

If you have more problems then talk to your local apps engineer.  That's why

the software costs so much.

Good luck,

Mike

On Tuesday 17 September 2002 10:32 am, ttsp@xxxxxxxxxxx wrote:
> Hi SI experts,
>
> I am currently using Ansoft HFSS. I want to extract inductive xtalk of two
> 1" parallel wires. In my simulation setup, I draw 2 wire conductors with
> seperation S (center-to-center) and diameter D. The thickness of insulator
> is P. The length of the wires is an inch long. An 1" air cylinder with 3*S
> radius is draw to enclose the 2 wires + insulator. Can someone tell me how
> to setup in "setup boundaries/sources".  Should I use Gap source/ Wave
> prot? I have try both, but both of the result give me negative inductance.
> Can someone give me some inputs?
>
> Thanks in advance.
>
> Tim
>
>
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