[SI-LIST] Re: parallel plane strange results

Leonard,
   
  The peak of the plane pair impedance is related to the plane pair resonance. 
  At low frequencies, there are less resonance modes, and the period of the 
resonace pattern is large. It is very likely that all your probing points are 
located at the area where the resonance is strong. If you plot over a wider 
frequency span, say 20 GHz, you will find the Z peak at different locations are 
no longer the same.
   
  Hope this helps,
   
  Guang Chen
   
  Istvan Novak <istvan.novak@xxxxxxxxxxx> wrote:
  Leonard,
The posted results look reasonable to me. In parallel-plate resonators 
the peaks have
the same frequencies regardless of location (for lossless case; with 
losses, they shift
slightly). Impedance minima, which look like series resonances, do change
significantly as you move over the planes. 

Regards,

Istvan Novak
SUN Microsystems

Leonard Dieguez wrote:

>Try this link:=20
>
>http://tinyurl.com/sxedx
>
>
>
>
>-----Original Message-----
>From: Richard Schumacher [mailto:schumach@xxxxxx]=20
>Sent: Wednesday, September 20, 2006 3:49 PM
>To: Leonard Dieguez
>Subject: RE: [SI-LIST] parallel plane strange results
>
>That link is now broken.
>
>Note that you can provide a much shorter alias url (one which is not
>obscured by line wrap) by visiting http://tinyurl.com
>
>
>-----Original Message-----
>From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
>On
>Behalf Of Leonard Dieguez
>Sent: Wednesday, September 20, 2006 4:43 PM
>To: si-list@xxxxxxxxxxxxx
>Subject: [SI-LIST] parallel plane strange results
>
>
>I'm getting unexpected results. Can anyone give me some insight to what
>is
>going on?
>
>=3D20
>This same effect happens if there are ports there also.
>
>=3D20
>I am trying to simulate the voltages and impedance at different points
>and
>distances. I have a current source and 3 voltage probes attached to
>parallel
>planes. One is close by and the other 2 are farther away. The closest is
>V1
>it has a resonance point in blue and is the lowest resonance. The other
>two
>seem to have a resonance higher in frequency. That is the question. The
>parallel plates have a constant capacitance so that does not change. The
>higher resonance points would point to less inductance and the curves
>would
>point to that also. My question is: is that true and why? And how? I
>would
>think that the inductance is higher since there is a farther
>distance.=3D20
>
>=3D20
>Here is a link to the results and also the SIwave set up
>
>http://pg.photos.yahoo.com/ph/lifeatthesharpend/album?.dir=3D3D9044scd&.s=
>r
>c=3D=3D3
>Dph&store=3D3D&prodid=3D3D&.done=3D3Dhttp%3a//pg.photos.yahoo.com/ph/life=
>atthe
>sh=3Da
>rpend/my_photos
>
>
>
>Leonard Dieguez
>HSIO group Altera
>
>
>
> 
>

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