[SI-LIST] FW: FW: Wire impedance at HF

Thanks Swee-Ann;

It's a good question, in the HFSS model (generally speaking ) is there
capacitive coupling between the wire and the port ?

Justin Tabatchnick

Intel, Sacramento

-----Original Message-----
From: Teo, Swee-Ann [mailto:Swee-Ann.Teo@xxxxxxxxxxxxx]
Sent: Monday, May 20, 2002 5:54 PM
To: 'justin.tabatchnick@xxxxxxxxx'; 'si-list@xxxxxxxxxxxxx'
Subject: RE: [SI-LIST] FW: Wire impedance at HF


justin,

the wire has some self-capacitance, referenced to some ground plane. it has
some self-inductance too, which u observe below 6GHz. the L and C resonants
at 6GHz. the dielectric-air interface might increase the self-capacitance of
the wire by a little, depending on what's the dielectric constant. it's also
important to define and choose your reference plane carefully as grounds are
often not perfect. 

annts

-----Original Message-----
From: Tabatchnick, Justin [mailto:justin.tabatchnick@xxxxxxxxx]
Sent: Monday, May 20, 2002 5:21 PM
To: 'si-list@xxxxxxxxxxxxx'
Subject: [SI-LIST] FW: Wire impedance at HF



No other structures. Model was a 150X150X125 mil high dielectric box with a
10 mil dia X 125 mil long copper rob running down the middle of it. I am
trying characterize a via and its' interaction with ground planes. 

Thanks

Justin
-----Original Message-----
From: Neeraj Pendse [mailto:cnepsc@xxxxxxxxxxx]
Sent: Monday, May 20, 2002 5:11 PM
To: justin.tabatchnick@xxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: Re: [SI-LIST] Wire impedance at HF


Justin,

Were there any other metal structures in the model? What and where were
the boundaries?

- Neeraj.

"Tabatchnick, Justin" wrote:
> 
> HI All;
> 
> I recently simulated in HFSS a straight wire imbedded in a dielectric . As
> predicted it behaved as an inductor between .6 GHz and 6 GHz , however
above
> 6 GHz the reactance was capacitive which does not make sense . Is this at
> all possible or is there something wrong with my model.
> 
> Thanks
> 
> Justin Tabatchnick
> Intel, Sacramento
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