Copyright: 1996 - 2024
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 World Wide Web (Internet) was largely an unknown entity at
the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps
while tying up your telephone line, and a nice lady's voice announced "You've Got
Mail" when a new message arrived...
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i have a momentum question too! - RF Cafe Forums
RF Cafe Forums closed its virtual doors in 2012 mainly due to other social media
platforms dominating public commenting venues. RF Cafe Forums began sometime around
August of 2003 and was quite well-attended for many years. By 2010, Facebook and
Twitter were overwhelmingly dominating online personal interaction, and RF Cafe
Forums activity dropped off precipitously. If the folks at
phpBB would release a version with integrated
sign-in from the major social media platforms, I would resurrect the RF Cafe Forums,
but until then it is probably not worth the effort. Regardless, there are still
lots of great posts in the archive that ware worth looking at.
Below are the old forum threads, including responses to the original posts.
|-- Amateur Radio
Gripes & Humor
-- CAE, CAD, &
Test & Measurement
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!
Post subject: Momentum
problemPosted: Mon Oct 10, 2005 7:19 am
Thu Oct 06, 2005 3:45 am
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.
Post subject: Posted: Mon Oct 10, 2005
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