Re: [SI-LIST] : Broadside Coupled Traces

Andy Burkhardt (mail@polar.co.uk)
Wed, 28 Apr 1999 10:05:37 +0100

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>Date: Fri, 23 Apr 1999 16:42:26 +0200
>From: Georg Ramsch <georg.ramsch@po.uni-stuttgart.de>
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>Subject: Re: [SI-LIST] : Broadside Coupled Traces
>References: <8525675B.004B6618.00@mail1.wlgore.com>
><3720376C.D1DEB583@huawei.com.cn>
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>Hello, Chen !
>
>chenlanbing wrote:
>> It is very useful about this item.Now I only know the differential Z
>calculate way about side to side. Who can give me the broadside coupled
>traces differential Z.
>
>Here some references for the calculation of brodside coupled lines,
>published in IEEE Transactions on Microwave Theory and Technology (MTT):
>
>1) S.B. Cohn / "Characteristic Impedances of broadside-coupled strip
>transmission lines"
> IRE / MTT-8 pp. 633-637, Nov. 1960
>2) J.P. Shelton, Jr. / "Impedances of Offset parallel-coupled strip
>transmission
>lines"
> IEEE MTT-14, pp. 7-15, Jan 1966.
>3) I.J. Bahl / "The Design of Broadside-Coupled Stripline Circuits"
> IEEE MTT-29, No.2 Feb. 1981 pp. 165-168
>
>Assumed, your design target is Zoo= 40 - 60 ohm, the formulas in above given
>references will be sufficient.
>
>Further references can be found in Wadells "Transmission Line Design Handbook"
>
>Besides, has anybody found an "Errata-Publication" for Wadells Handbook ???
>
>CU :-)
>
>Georg
>
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Dear Georg,

I found one a couple of years back. It was maintained on a Microwave Design
company's web site in New England area. (I think)
I have an out of date Errata (194kB, 12/6/97, Wadell Errata.doc, Winword
format)
that I downloaded a while back when we were chasing equations.
After what seemed like a never ending search we opted for a more
universal approach using Boundary Element Method field solving.

For those that are interested the errata can be downloaded from:

http://www.guidedwave.com/errata.doc

Hope this helps.

Best regards

Andy Burkhardt
Product Manager
Email: mail@polar.co.uk
Tel: + 44 1481 253081
Fax: + 44 1481 252476
http://www.polar.co.uk
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World leaders in PCB faultfinding and controlled impedance measurement
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