Author Topic: Mechanical 3D filter realization from coupling matrix  (Read 223 times)

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Offline jujun

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Mechanical 3D filter realization from coupling matrix
« on: April 24, 2019, 12:56:44 am »
Hello,
I feel the need to know more about microwave filter that are made of coaxial
cavity cell that are coupled, and sometime with a topolgies like "cascaded tuplet" or "cul de sac".

It seems that this kid of filter that is everywhere (like in mobile phone base station) is first made with a software that generate a coupling matrix. (ex : http://www.gwtsoft.com/ ) And then this coupling matrix is used to make the mechanical filter.
But everything I read about it is kind of magical, because there is nothing about how it is done.

For exemple here : https://www.cst.com/solutions/article/filter-design-technology-2017
There is nothing about the mechanical part, it's "magical".

So I guess that you have to model one 3D cell and then build your filter by cascading them ? But how to use the coupling matrix to automate it ? It must be a quick way to do it.

Any pointers on how to do it ?
Any pdf about it ? or book ?
Is there any software that will do the work ?

Thank you


« Last Edit: April 24, 2019, 07:25:34 pm by jujun »
 

Offline rfeecs

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Re: Mechanical 3D filter realization from coupling matrix
« Reply #1 on: April 24, 2019, 09:42:31 am »
Here's one pdf from the website you referenced.  The whole process is gone through, including determining mechanical dimensions:

http://www.gwtsoft.com/Misc/Hagensen3.pdf
 
The following users thanked this post: Mechatrommer, jujun


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