There are 0 pins on the high power RF circuit board.Mixer RF Type from the Evaluation board.Use HMC523 to search for variants of the RF Board.PCB mounts RF Board.
109998-HMC523LC4 Features
0 pins Mixer Type
109998-HMC523LC4 Applications
There are a lot of Analog Devices Inc. 109998-HMC523LC4 RF Boards applications.