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

Georg Ramsch (georg.ramsch@po.uni-stuttgart.de)
Wed, 04 Aug 1999 08:08:54 +0200

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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