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:
DC Blocking Capacitors - 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: DC Blocking Capacitors Posted: Thu Jan
10, 2008 12:16 pm
Joined: Wed Aug 16, 2006
I am using a 1.5
to 8 GHz LNA for one of my applications. Un fortunately, I have to use
off chip DC blocking Capacitors. How should I select the offchip Blocking
CAP so that it provides very loww insertion loss and doesn't effects
the noise figure much. This application works over 3.25 to 8 GHz
Design Engineer- RF
Post subject: Posted: Thu Jan 10, 2008
Joined: Thu Sep 25, 2003 1:19 am
Check out the silicon caps from
Vishay. I use them in a similar application. Performance is good, soldering
them to the boards is a nightmare.
Post subject: Posted: Fri
Jan 11, 2008 2:16 am
Joined: Mon Jun 27,
2005 2:02 pm
There are many manufacturers
for RF capacitors: AVX, Murata, Taiyo-Yuden...
To get low insertion
loss, I choose the value for the capacitor to give a reactance Xc of
3 to 4 ohms in the lowest frequency of operation.