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Tuning process of resonator and combline filter

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mallelauma

mallelauma

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hi toall
i designed interdigital filter using the equations
inthe matthei book any 1 post here the tuning procedure
for the resonator filter and also for the combline filter tuning
thank you
 

dishal filter

Generally, you can tune the filter in the S parameter, otherwise you can use shorted_circuit tunning techque and reflected group delay tuning techqiue.
 

tuning interdigital filter dishal

hello james cook thanks for your reply ,
can you give me the any detail procedure for the methods you have mentioned here
understand that im very new here but i have to do it.

thank you very much!!!!!!
 

kashyapastron

Hi

Even I'm having problems with tuning. I saw the swanson and wenzel's paper and also ansoft HFSS workshop presentation by Dawson RF design where they have shorted out all the resonators but two. Then they have manually tuned it for proper resonance and coupling bandwidths. For this they have assigned ports at the combline resonators. I'm not sure how to do this. What I did was to draw a 2D circle on the wall just after the capacitive gap and declared a waveport there. Is it correct. Please help

Thanks
 

Re: tuning of a filter

hi
this is already here in this forum
 

    mallelauma

    mallelauma

    Points: 2
    Helpful Answer Positive Rating
Re: tuning of a filter

The thread was removed it seems! Could you please explain the procedure
 

Re: tuning of a filter

kashyapastron wrote:
The thread was removed it seems! Could you please explain the procedure
Click to expand...

r u tried this its working .
oyu have to copy the link as it is and enter, ok its working only ,there is paper which explians the manual tuning procedure.

Added after 13 minutes:
 

    mallelauma

    mallelauma

    Points: 2
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tuning of a filter

Yes the link is working, but the most important thing in tuning is the experience. Try to find a skillful worker to help you at the first time.
 

tuning of a filter

want filter simulatio
thanks
 

Re: tuning of a filter

jamescook wrote:
Yes the link is working, but the most important thing in tuning is the experience. Try to find a skillful worker to help you at the first time.
Click to expand...

yes its try we will get good knowledge about tuning after experience only ,

but i dont have such guidance for me here . if any one know any book that can be as a guidance for me as a good experienced person with its tuning technique, sothat i thankful to you all.

thank you
 

Re: tuning of a filter

mallelauma said:
hi toall
i designed interdigital filter using the equations
inthe matthei book any 1 post here the tuning procedure
for the resonator filter and also for the combline filter tuning
thank you
Click to expand...

I suggest you dig up Milton Dishal's november 1951 IRE paper discussing the tuning

here's the reference:

M. Dishal, "Alignment and Adjustment of Synchronously Tuned Multiple Resonator-Circuit Filters" Proc. IRE 39, Nov. 1951, pp. 1448-1455

this is a classic.

Lance
 

Re: tuning of a filter

Lance_RFdude.com wrote
here's the reference:

M. Dishal, "Alignment and Adjustment of Synchronously Tuned Multiple Resonator-Circuit Filters" Proc. IRE 39, Nov. 1951, pp. 1448-1455
Click to expand...

you or any one have this paper,post here plz!!!!!!!!!!!!!!!
it is appriciated

thanks in advance
 

Re: tuning of a filter

I will try to find the Dishal's paper, If success, will be scanned.
Lot of classics are difficult to find (Pupin, Bode, Kraupp, Smith, ...),

In a fact, Im interesting in a classic papers.

Best regards
 

Re: tuning of a filter

thank you for your reply ,
any one post that paper here, so that it is very helpful to engineers who r waiting for that

thank you
 

Re: tuning of a filter

Dear mallelauma,

Tuning process of the filter is very hard procedure. This is one of the major reason why filters are so expensive. But when we are talking about interdigital filter, especially when it is microstrip filter on high quality PCB, we have a good possibility to design the filter that will not require tuning at all. This is actually a major goal for designer to create inexpensive filter that match the spec. It is not easy but possible if you have enough experience and use good simulation tool. I use most of the time Genesys M-filter for design interdigital filters and also LINC2 which is surprisingly affordable (you may check it on www.appliedmicrowave.com) and very easy to use. The Pro version cost about $400. Then I translate LINC2 design to Sonnet, which is also inexpensive program and in 10 minutes or so filter is done. I need to reiterate that this is not easy, you need to spend a lot of time to collect experience.

Best regards,
RF-OM
 

Re: tuning of a filter

thank you RF-OM , as your each wordsare true, but i dont have any problem to design a microstrip filter with out need of tuning ..........
but for the cavity filter i must do tuning and i need it for my project application that is the main problem thats y im asking that how to tune those cavity round rod filters i need the paper that is asked by CITIZEN ....
that is dishal alignment and tining of filter paper any one post that paper here plzzzzzzzzzzz
thank you in advance
 

Re: tuning of a filter

For cavity filter you are absolutely right and you need this paper. I am looking for it, but did not find yet.

Best regards,
RF-OM
 

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