[SI-LIST] Re: Transmission lines: book commentary
- From: "Grasso, Charles" <Charles.Grasso@xxxxxxxxxxxx>
- To: <Ken.Cantrell@xxxxxxxxxxxxxxxx>, <Mark_Burford@xxxxxxxxxxx>, <RGeorgerian@xxxxxxxxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Tue, 11 Jul 2006 17:24:30 -0600
Agreed! Save the brain power - buy a 2D solver.
I have this book and its an excellent source on how
to "transform" transmission lines into computer code.
There are many Phds in the business doing exactly that
and all at your fingertips - with a good 2D solver.
Best Regards
Charles Grasso
Compliance Engineer
Echostar Communications Corp.
Tel: 303-706-5467
Fax: 303-799-6222
Cell: 303-204-2974
Pager/Short Message: 3032042974@xxxxxxxxx
Email: charles.grasso@xxxxxxxxxxxx;
Email Alternate: chasgrasso@xxxxxxxx
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Ken Cantrell
Sent: Tuesday, July 11, 2006 10:39 AM
To: Mark_Burford@xxxxxxxxxxx; RGeorgerian@xxxxxxxxxxxxxxxxx;
si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Transmission lines: book commentary
Richard,
Have to agree with Mark. Closed form solutions, even advanced ones,
fall
apart when you use them in coupled line calculations. The error can
approach 30%. Might as well flip a coin. You can't design with them at
today's geometries and speeds.
Ken
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Mark Burford
Sent: Tuesday, July 11, 2006 10:08 AM
To: RGeorgerian@xxxxxxxxxxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Transmission lines: book commentary
Hi Richard,=3D20
I have done masses of research back to the 50s where a guy called S.
Cohn developed the first methods and equations for doing as you say.
Some people got very advanced at doing this and achieved almost 1%
error. I have that book and others have recommended it as it provides
insight into how transmission lines work and how to model them.
As I am sure 90 percent or more of people on this list will tell you, go
get a 2D field solver! Worth their weight in gold! However we have seen
variations in the results each of these can give as well for like for
like geometries.
As I see it, computer modelling code becomes inaccurate much more
quickly than field solving code ever would if in fact it ever would.
Cheers
Mark
Mark Burford
mburford@xxxxxxxxxxx=3D20
07782134422
=3D20
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Georgerian, Richard
Sent: 11 July 2006 16:44
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Transmission lines: book commentary
Greetings All,
Has anyone read the book, Digital Transmission Lines - Computer
Modelling
and Analysis, by Kenneth D. Granzow? He has included several programs
done
in C to calculate capacitance and inductance of different transmission
line
configurations. I don't have too much experience in C, so has anyone
tried
these programs to see how they compare to other similar programs.
Thanks.
Richard
=3D3D=3D3D=3D3D=3D3D=3D3D
Richard Georgerian
Carrier Access
Compliance Engineer
5395 Pearl Parkway
Boulder, CO 80301
U.S.A.
email: mailto:rgeorgerian@xxxxxxxxxxxxxxxxx=3D20
tel: 303-218-5748
fax: 303-218-5503
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