[SI-LIST] Re: PCB tracks
- From: "Richard A. Schumacher" <schumach@xxxxxxxxxx>
- To: ray_waugh@xxxxxxxxxxx
- Date: Mon, 12 Aug 2002 9:53:06 CDT
>
> You write "People with RF and microwave experience, and digital
> designers who heard about RF design techniques, claim that 90
> degree corners create impedance discontinuities..."
>
> At the risk of being contentious, I am one of those with experience
> - forty years of it. I maintain that a properly mitered 90 degree
> bend in a 50 ohm microstrip line cannot be detected by any TDR ever
> made, nor can it be detected or "seen" by any frequency-domain
> network analyzer working up to 12 or 18 GHz. The mitering removes
> the 10 to 100 femtoFarads of shunt capacitance that a unmitered bend
> would have.
>
> The most common form of right angle turn in a RF board is a mitered
> 90 degree bend. Break open your cellphone and check.
That is consistent with Istvan's statement as he was talking about
unmitred corners. No contention required :_>
(Humble request to list participants: as a kindness to us UNIX
Neanderthals, please limit your line lengths to less than 80
characters.)
Richard Schumacher
Hewlett Packard Company
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