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Two questions on designing a tuning varactor based BPF

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jevons9958

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Hey, I have two questions here need some advices.

For the tuning varactors, how can I bond them with the short-circuited stubs fabricated on RT/Duroid substrate? The stubs widths are 750µm. Can I use wire/ribbon bond? Or I just solder them togehter? The whole device will operate at X-band. I've read many papers but can't find any answers till now.

My second question is about the via/grounding tehcnique.
Once I designed an X-band BPF using 4 short-circuited stubs that are λg/4 long with with three connecting lines λg/4 long also. However, due to the poor via method, the measured S21 is much worse if I use the open stub technique. I grounded those stubs using silver paster which seems not a good way at all.
So, could you please give me some advice on how to ground those short-circuited stubs?

Thanks,

Joe
 

vfone

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Put more vias in parallel (up to 4).
 

kspalla

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Better if you can model it in 3D and analyze.

you can then able to decide what is the location of vias, via -diameter and how many are required etc.
 

jevons9958

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Thanks for the advice. I think I need read more papers then.
 

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