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AWR1243: RF Cascade reference board impedance

Part Number: AWR1243

Regarding the cascaded RF reference board files, we have a simple question on the stackup.  The feed lines to the antennas appear to be designed for a 53 ohm coplaner waveguide.  Rogers suggested designing for 48 ohms from experience with the tools.  Did TI go higher for any important reason, or just "close enough"?