Monzerje
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Do you only have 1mm substrates? Or can you get thinner substrates?
Yes there is 0.6mm but its size is small 10x15 cm
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In the attached pdf you see em simulations (full wave) of the bandpassfilter for fr4 substrate with
1mm and 0.5mm thickness of substrate.
With 0.5mm it looks like a fiter, but with 1mm. But with 1mm it's useless.
EM simulation was done with CST MWS.
I am still figuring out how to resolve the physical parameters issue, since volker@muehlhaus said they do not make sense