Mechanical 3D filter realization from coupling matrix

• Mechanical 3D filter realization from coupling matrix
  Posted by jujun on 23 Apr, 2019 14:56
• 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
  
  
  
• #1 Reply
  Posted by rfeecs on 23 Apr, 2019 23:42
• 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