How to implement Cs in a combline filter with Rods?

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habib83

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combline

Hi,
I want to design a combline filter with Rods. how i can implement the end variant capacitors (Cs) in this structure?
 

Re: combline

One way is to drill in the end of the rods some holes, and for tuning use some screws which portudes in these holes. In this way you can tune the rods end capacitance to the ground. See the attached picture.

rgds,
Al
 

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