What substrate and its thickness are recommended for AD9914 & ADF5355?
I can't comment on the AD9914 but on the ADF5355 we used the attached stack up on R4003. Other materials and stackups can be used but be sure to evaluate the thermal properties (conductivity, Cte, etc) as well as properties such as dK and ground plane spacing that will impact the impedance of the RF traces. Tangent loss should also be a consideration if using at microwave frequencies. Finally follow the recommendations for the ADF5355 package footprint and use thru vias in the paddle to maximize heat transfer to your heat sink / chassis.
For the AD9914, please see attachment for the stack up of the evaluation board.
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