You can also put fills just at the end of your traces to square off the corners.
_____________
Brian Guralnick
----- Original Message -----
From: "Henrik Thurfjell" <[EMAIL PROTECTED]>
To: "Protel EDA Forum" <[EMAIL PROTECTED]>
Sent: Wednesday, June 13, 2001 5:20 PM
Subject: Re: [PEDA] Microwave PCB layout
| John
|
| Thanks for your input.
| This is a 10GHz circuit and the RF guys have been pretty particular about
| the bevels. Now it would be interesting to know if beveling is just another
| superstition. If rounded corners will work just as well or better, not
| introducing impedance transitions in the line, that would indeed make this
| task easier. Could your field solver answer that question?
|
| Henrik
|
| ----- Original Message -----
| From: John Haddy <[EMAIL PROTECTED]>
| To: Protel EDA Forum <[EMAIL PROTECTED]>
| Sent: Wednesday, June 13, 2001 8:42 AM
| Subject: Re: [PEDA] Microwave PCB layout
|
|
| > Protel doesn't handle RF layout well. It can't deal with stripline
| > design (e.g. defining a piece of stripline in schematic of specific
| > length and width doesn't map well to PCB - short of defining a
| > library full of segments (which doesn't provide flexibility in layout))
| >
| > With regard to beveled corners, I was shown a reference not long ago that
| > discussed the origin of beveling. It turns out that beveled corners were
| > developed as a workaround because arcs couldn't be defined in the CAD
| > systems available at the time! Radiussed corners are supposedly better
| > than the approximation given by a beveled corner.
| >
| > I haven't personally used a field solver to confirm this, but some of
| > our RF designers were more than happy to allow the use of arcs in
| > preference to bevels (which are a right royal pain to do in Protel!).
| >
| > Cheers,
| >
| > JohnH
| >
| > > -----Original Message-----
| > > From: Henrik Thurfjell [mailto:[EMAIL PROTECTED]]
| > > Sent: Thursday, 14 June 2001 1:02 AM
| > > To: Protel EDA Forum
| > > Subject: [PEDA] Microwave PCB layout
| > >
| > >
| > > Hi all Protel fans
| > >
| > > How well can Protel handle microwave PCB layouts. You know, as
| > > beveled corners of strip lines.
| > > The default rounded trace end is a major obstacle in this case.
| > > Can that be changed to a square end?
| > > Can the mitering of corners be changed to "beveling"?
| > >
| > > Regards
| > > Henrik
| > >
| > > ============
| > > Henrik Thurfjell
| > > Megatron Engineering
| > > 1149 Susan Way, Sunnyvale CA 94087
| > > Direct 408 737 1718
| > > FAX & Messages 408 739 2429
| > > email: [EMAIL PROTECTED] or [EMAIL PROTECTED]
| > >
| > >
| > >
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