Re: [SI-LIST] : Broadside Coupled Traces

Georg Ramsch (georg.ramsch@po.uni-stuttgart.de)
Fri, 23 Apr 1999 16:42:26 +0200

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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