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:
3:1 microwave combiner - 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: 3:1 microwave combiner
Sun Apr 24, 2005 11:31 am
I want to know about
3:1 directional couper (combiner). Can anyone provide me papers, articles
or circuits about it?
Thanks for your time and help.
Post subject: LNA (Low noise amplifier) using an NPN
BJT with feeback
Unread postPosted: Sat Apr 23, 2005 2:18 pm
Joined: Sat Apr 23, 2005 2:09 pm
Location: Tampa, FL
This is my first post,
so please excuse my newbieness.
I'm reading up on LNA design,
and I'm curious about the DC bias feedback setup using a reactive component
(e.g. inductor) at the NPN's emitter lead to improve stability.
Can someone direct me to the formal analysis of this with regards
to relating it to stability? I'm assuming that it helps maintain the
collector current to have a uniform stability across a band of frequencies.
I'm just not to sure how to come up with the reactive component value.
I can see the results right away using ADS, but I would like to
see some sort of analysis on paper.
Thank you very much!