[SI-LIST] Re: Five Wire Formula in Wadell
- From: "Swanson, Dan" <Dan_Swanson@xxxxxxxxxxxx>
- To: "'cschuste@xxxxxxxxxx'" <cschuste@xxxxxxxxxx>,si-list@xxxxxxxxxxxxx
- Date: Fri, 2 May 2003 11:59:54 -0400
Leading term should be 173/sqrt(Er) and its log10, not ln.
I checked it very quickly for d=10 D=100 Er=1
2D FEM solver =173 ohms, corrected formula =178 ohms.
I don't have my Ref Data book here, its at home.
Dan
Dan Swanson EMAIL: d.swanson@xxxxxxxx
Forem USA PHONE: 978-834-4085
37 South Hunt Road FAX: 978-388-7077
Amesbury, MA 01913
> -----Original Message-----
> From: Christian Schuster [mailto:cschuste@xxxxxxxxxx]
> Sent: Friday, May 02, 2003 11:18 AM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Five Wire Formula in Wadell
>
>
> Does anybody have experience with the five-wire impedance formula
> in Wadell's "Transmission Line Design Handbook" (section
> 3.3.4, page 70)?
>
> The five-wire problem refers to a center signal wire
> surrounded by four
> ground wires at constant distance.
>
> I have a "feeling" that the impedance comes out too high ...
>
> BTW, I checked the errata sheet but couldn't find any changes to this
> formula.
>
> Any other reference or a well-known example might help too.
>
> Thanks!
>
> Christian Schuster
> IBM
>
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