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DC Blocking Capacitors - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.

Post subject: DC Blocking Capacitors Posted: Thu Jan 10, 2008 12:16 pm


Joined: Wed Aug 16, 2006 8:20 am
Posts: 23
Location: India
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

Ashish Bondia,
Design Engineer- RF


Post subject: Posted: Thu Jan 10, 2008 12:25 pm


Joined: Thu Sep 25, 2003 1:19 am
Posts: 50
Location: texarcana
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

Site Admin

Joined: Mon Jun 27, 2005 2:02 pm
Posts: 373
Location: Germany
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.

Posted  11/12/2012
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