[SI-LIST] Re: RF via

I found a source that describes an RF via (which is bad terminology, I know)
as follows:

1. Large anti-vias (do they really mean anti-pads).
2. No pads on power and ground planes.
3. No pads on signal planes that are not used.



-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Perry Qu
Sent: Thursday, September 20, 2001 9:54 AM
To: DSWANSON@xxxxxxxxxxxxx
Cc: 'alexh@xxxxxxxxxxxxxxxx'; Si-List
Subject: [SI-LIST] Re: RF via
Importance: High



Hi!

I would imagine that RF via is similiar to a coax structure, where you have
several return vias surrouding the signal vias. This is to match 50 ohm
impedance as close as possible and reduce the discontinuity effect of the
vias.

Regards

Perry

Dan Swanson wrote:

> Physically short, close to the component.
> Lowest impedance path possible to true ground,
> not the local ground. Via always has some
> finite inductance.
>
> Dan
>
> On Wednesday, September 19, 2001 5:14 PM, Alex Horvath
> [SMTP:alexh@xxxxxxxxxxxxxxxx] wrote:
> >
> > What are the particulars of a "rf via"?
> >
> > I'm using a component which switches at 2 Ghz that recommends the use of
> > this type of via.
> >
> >
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--
Perry Qu

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