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strategy to deside which material is the best for RF board

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yef smith

Joined Aug 2, 2020
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Hello ,I have a multilayer board it has sections of differential ports connected to VNA:
70 ohm layer 5, length 6 inches
70 ohm layer 10 , length 6 inches

90 ohm layer 5
90 ohm layer 10
etc..

So I have many SDD21 and I need to decide what is the best material to use for this board.
I know I can subtract two S21 plots of the 10 inches and 5 inches and get loss per inch.
Two questions:
What engineers do given this setup to decide what metrial is the best to use?
Thanks.
 
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