Re: [SI-LIST] : Need Information on effect of 45 degree angles on high

Lum Wee Mei (lweemei@dso.org.sg)
Wed, 04 Aug 1999 17:18:10 +0800

You can have a look at UltraCad website where Doug Brooks wrote an article on "90 Degree Corners : The Final Turn" and "Right Angle Traces". These articles will be of great help to you. If you have the PCD magazine, the first
article is in there too.

Regards.

Georg Ramsch wrote:

> Hello, Paul !
>
> Is your transmission line a microstrip or strip line construction ?
>
> If your CAD system supports it, just design the transmission line as
> "optimal rounded bend", such you avoid problems with impedance steps or
> radiating (radius as large as possible).
>
> A good listing of non-90-edge routing is delivered by Wadell/Transmssionline
> Design Handbook,
> chapter 5.5.
>
> CU
>
> Georg
>
> "Denomme, Paul S." wrote:
> >
> > Hello All,
> >
> > I am trying to find out at what frequency does a 45 degree angle in
> > circuit traces have a large affect. Has there ever been a study on the
> > impact of 45 degree angles on circuit board traces? If so, where can I get
> > some further information.
> >
> > Howard Johnsons book states "Don't worry about 45 degree angles they
> > are fine as is." Has anyone ever had a problem that contradicts this
> > statement?
> >
> > I am designing a board right now that has clock frequencies up to
> > 622 MHz. I believe I will not have any problems using 45 degree angles at
> > 622 MHz, but would appreciate anyone's input on this issue.
> >
> > Thanks in advance for your help.
> >
> > Paul S. Denomme
> > Backplane Design Engineer
> > Viasystems Technologies Inc.
> > Richmond, VA 23113
> > 804-226-5355
> > E-MAIL: paul.denomme@viasystems.com
> >
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