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Question in helical cavity filter

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skyenew

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Hi,guy,I am Chinese student and I am new here.I have some problems and I need your help.
A project I am going on is for tunable filter,the trimmer capacitors are placed out of cavity and are added to open end.But I worry that the voltage of open end are too high to make capacity broken down. So guys,can you tell me whether the voltage can be measured in HFSS?
and,what kind of line should be used to connect the helical with capacity?
What needs to pay attention?
anyone can help me?:?:
 

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