# I Have a Momentum Question Too! - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

guest
Post subject: i have a momentum question too! Posted: Mon Oct 10, 2005 2:54 am
Other EM software let you plot characteristic impedance and attenuation constant of a transmission line but I didn't see how you would accomplish that in Momentum! Is there a way to plot these two plus the effective permittivity vs. frequency in Momentum. Is there a good tutorial on that. The ADS help doesn't seem to cover this. Nice day!

Top

pallavi_d
Post subject: Momentum problemPosted: Mon Oct 10, 2005 7:19 am

Captain

Joined: Thu Oct 06, 2005 3:45 am
Posts: 7
Location: India
Hi,

As far as i know , its not possible to plot characteristic impedance and attenuation constant of a transmission line in momentum .I had also tried it , and had the same doubt some months back.
The answer i got was we need to use matlab for getting the plots.
If anyone out there knows the answer let me know too.

regards,

Pallavi

Top

guest
Post subject: Posted: Mon Oct 10, 2005 4:16 pm
i don't want to go through the matlab why...it's surprising that momentum won't let users easily plot attenuation constant while other CAD tools do. any way, gamma = alpha + jBeta where as all know alpha is the attenuation constant....meaning, you need the real part of gamma to get alpha

now momentum generates gamma and you can plot it, which for many designers isn't that useful because they're used to looking at alpha. but as with any plot ADS lets you plot real part of gamma Real(GAMMA) and the real of gamma which is supposedly alpha will be plotted. i did that but i do not think i got the right plot...the attenuation constant was almost zero ...e-17 order while all the other plots like s-param, characteristic impedance are normal and what i expected....try this and see if you get any sensible result and then let us know here...take care

Posted  11/12/2012

RF Cafe Software

Wireless System Designer

RF & EE Symbols Word
RF Stencils for Visio
Calculator Workbook
RF Workbench
Smith Chartâ„¢ for Visio
Smith Chartâ„¢ for Excel

1996 - 2022
Webmaster:
Kirt Blattenberger,
BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website:
AirplanesAndRockets.com

Try Using SEARCH
to Find What You Need.
There are 1,000s of Pages Indexed on RF Cafe !