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AWR2243: The width of RF CPWG line of DEMO board

Part Number: AWR2243

Hi all

When i see the demo board of AWR2243P(PROC054D), i find the width and space of RF CPWG line is 8.4mil/5mil.(The width is 8.4mil and the space is 5mil)

But in the simulation by HFSS, this width and space is not the best 50 ohm.

So i want to know why TI choose this width and space. Do you have any special considerations?

Thanks.