There are 0 pins on this high power RF circuit board.The Evaluation board type is Switch, SPST.Try searching with HMC1055 to find RF Board variants.The mount is attached to PCB.
EVAL01-HMC1055LP2C Features
0 pins Switch, SPST Type
EVAL01-HMC1055LP2C Applications
There are a lot of Analog Devices Inc. EVAL01-HMC1055LP2C RF Boards applications.