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
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S21 in Smith-Chart ? - 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: S21 in Smith-Chart ?
Fri Jul 08, 2005 5:24 am
does it make sense to
visualize S21 in a Smith-Chart ? What would be your reference impedance
Fri Jul 08, 2005 7:49 am
Not really.. If there is gain you wont
see anything unless you have an expanded smith chart. If you want a
visual aid for S21, a polar chart is the way to go.
Unread postPosted: Mon Jul
11, 2005 3:39 am
Tue Mar 15, 2005 11:43 pm
Yes, I agree with the previous post.
just want to add that,
smith chart is limited to Magnitude 1. While at most cases, |S21| >1.
That's why, it can't be seen in the smith chart unless you expand it.