Broadband agile filter - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues - primarily having to spend time purging garbage posts from the board. At some point I might start the RF Cafe Forums again if the phpBB software gets better at filtering spam.

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

-- Amateur Radio
-- Anecdotes, Gripes & Humor
-- Antennas
-- CAE, CAD, & Software
-- Circuits & Components
-- Employment & Interviews

-- Miscellany
-- Swap Shop
-- Systems
-- Test & Measurement
-- Webmaster

SEO

Post subject: Broadband agile filter

Posted: Thu Nov 02, 2006 4:46 am

Lieutenant

Joined: Thu Nov 02, 2006 4:40 am
Posts: 1

I need to find a broaband agile filter. (2 to 18 GHz, BW = 200 MHZ)
A yig filter is not a solution because the BW stills not the same on each frequency.
A solution?....

Thanks!

nubbage

Post subject:

Posted: Thu Nov 02, 2006 7:52 am

General

Joined: Fri Feb 17, 2006 12:07 pm
Posts: 312
Location: London UK

It sounds like a job for down-convert>filter>up-convert with a tracking local oscillator.

It would comprise a 3 to 19GHz YIG oscillator, down-conversion mixer, 200MHz Bandpass filter and low-gain IF amp at 1GHz, and an up-conversion mixer, then a final amplifier to make up losses.

The bricks are available, but I am not sure if any company markets the full 9 yards as an item.

Posted 11/12/2012

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 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: AirplanesAndRockets.com

My Daughter's Website: EquineKingdom