There are 0 pins on the high power RF circuit board.Phase Shifter RF Type from the Evaluation board.Use HMC538 to search for variants of the RF Board.PCB mounts RF Board.
108812-HMC538LP4 Features
0 pins Phase Shifter Type
108812-HMC538LP4 Applications
There are a lot of Analog Devices Inc. 108812-HMC538LP4 RF Boards applications.