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Cavity Filter Study - 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.


Camel
Post subject: Cavity Filter Study
Unread postPosted: Fri Dec 26, 2003 10:27 pm

I am current looking for the general design guide line for the reentrant cavity filter. I am new and would like to know what is the steps that I need to follow for designing such a filter.
Any comments/suggestion/feedback is welcomed. Thanks in advance.

:roll:


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JGP
Post subject: Cavity Filter Study
Unread postPosted: Wed Dec 31, 2003 2:26 pm

Designing, testing and even manufacturing of RF, Microwave and Sub-Millimeter filters circuit takes experience and hard work. There are many approaches and tradeoffs when it comes to passive filters. My advice to you is to invest lot of time studying (compare many books and authors’ filters design, approach and tradeoffs), getting familiar with different type of equipment and tools (Network and Spectrum Analyzers, Signal Generators, Power Meters, Signal Attenuators, Critical Cable tool, Simulation Software…etc – you can buy used (software must be new and with option for optimization) ones at surplus but, make sure they work well or rent some). By employing this method you will be unable to make rapid progress in building filters. Remember, no filter is good for use until tested and it worked according to desired specifications (overkill specs results to begin is a real good approach). Please, be aware that in these modern days, mixed signals (analog/digital) are often required and/or digital signals alone for transmission and receiving in wireless communications applications. Therefore, one must work with reliable and accurate design tool (software) in order to get proper results. We have used good hand calculator in past and proved that software is the best way to go for any RF Engineer. I thought this might help you at beginning. Good luck!

Sincerely,
John Pereira


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Camel
Post subject: Cavity Simualtion using HFSS
Unread postPosted: Sat Jan 03, 2004 2:19 am

Hi John,

Thanks for your advise. I am currently having some background on ADS and HFSS, and would like to use this tool for the cavity design. My goal is to design a BPF, with 3.6 GHz center freq. I would like to know where and how should I start off? From LPF and convert to BPF or ??? Pls advise :?:


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JGP
Post subject: Cavity Filter Study
Unread postPosted: Sun Jan 04, 2004 6:18 pm

Camel,

Please, answer the following:
Are you doing R & D on this specific filter design? What is the filter application for? You could design this filter by using Waveguide (should it be for high power level…) or Distributed Element filter topologies. Why have you selected cavity filter?
I will be keen to help you design and build this filter. However, in order to do that, I will need to have complete electrical specifications. Mechanical B.O.M. (bill of material) I will advise. Due to it will take us lots of communication; I’d prefer to be contacted via email. Following are my emails: jgp882003@yahoo.com or jgp95@hotmail.com

Sincerely,
John Pereira


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JGP
Post subject: Cavity Filter Study
Unread postPosted: Mon Jan 05, 2004 7:32 pm

Camel,

Following are some information about Re-entrant Cavity! I personally haven’t design it, however, I thought these might help you.

http://accelconf.web.cern.ch/AccelConf/ ... PDO022.pdf

http://accelconf.web.cern.ch/AccelConf/ ... PDO022.pdf

Should you need further help, please let me know.

Sincerely,
John Pereira


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JGP
Post subject: Cavity Filter Study
Unread postPosted: Mon Jan 05, 2004 7:53 pm

Camel,

Due to you are doing design and build the Re-entrant cavity filter, this information below may be even better.

http://www.ece.eps.hw.ac.uk/~ceeem/Misc ... npap11.pdf

Sincerely,
John Pereira


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Camel
Post subject: Cavity Filter Study [3]
Unread postPosted: Mon Jan 05, 2004 8:29 pm

Hi John,

Thanks for posting me all this information and I found that the last one is really useful. I will try to read through it and appreciated if you could help when I have encounter any questions on this articles.

Have a nice day!! :D


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JGP
Post subject: Cavity Filter Study
Unread postPosted: Tue Jan 06, 2004 1:47 pm

Camel,

You are welcome. I will be keen to help you.

John Pereira



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