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...
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:
simulation of an impedance step, Transistor -> Match Net. - RF
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: simulation of an impedance step, Transistor ->
Match Net. Posted: Fri Apr 28, 2006 1:23 pm
Joined: Fri Apr 28, 2006 1:09 pm
I wonder how to simulate follwing condition correctly:
I have a Transistor with a connection lead of 12 mm width.
first matching element has a width of 23mm.
I have a large signal
model of the transistor for my simulator (ADS).
Das anyone konw,
how to simulate the behaviour correctley?
Transistor -> Microstripline
Transisor -> Impedance Step (12mm
-> 23mm) -> Microstip (23mm)
Both simulatons show different
Would be happy for the comments from you.
Post subject: Posted: Fri Apr 28, 2006 3:43
Joined: Mon Jun 27, 2005 2:02 pm
The second option
which you mentioned, namely to use an impedance step is the right one.
Of course that both simulations show different results, because you
have a discontinuity in the impedance if you don't use an impedance
step, and therfore you get an impedance mismatch and poor return loss.