0 pins are on the high power RF circuit board.Input RF type Phase Shifter of the Evaluation board.Using the HMC935 search parameter, you can discover variants of the RF Board.
EVAL01-HMC935LP5E Features
0 pins Phase Shifter Type
EVAL01-HMC935LP5E Applications
There are a lot of Analog Devices Inc. EVAL01-HMC935LP5E RF Boards applications.