0 pins are on the high power RF circuit board.Input RF type Switch, SPDT of the Evaluation board.Using the HMC646 search parameter, you can discover variants of the RF Board.PCB is the one that mounts RF Board.
118098-HMC646LP2 Features
0 pins Switch, SPDT Type
118098-HMC646LP2 Applications
There are a lot of Analog Devices Inc. 118098-HMC646LP2 RF Boards applications.