Input RF type Switch, SPDT of the Evaluation board.Using the HMC849 search parameter, you can discover variants of the RF Board.PCB is the one that mounts RF Board.
106975-HMC849LP4CE Features
Switch, SPDT Type
106975-HMC849LP4CE Applications
There are a lot of Analog Devices Inc. 106975-HMC849LP4CE RF Boards applications.