[SI-LIST] Re: Ansoft HFSS - inductive xtalk setup 2
- From: zhiping <zhiping@xxxxxxxxx>
- To: ttsp@xxxxxxxxxxx
- Date: Tue, 17 Sep 2002 09:41:55 -0700
Hi Tim,
You shoud use Y-parameter to calculate the inductance and Z-parameter for
capacitance. The relationship is Yload=1/Zload. The details are:
1. Yload=1/Zload (Matrix operation)
2. For port 1: Z11=(1/Yload(1,1))
3. L=imag(Z11)/2/pi/f
Thanks.
Zhiping
ttsp@xxxxxxxxxxx wrote:
> 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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