There are 0 pins on this high power RF circuit board.The Evaluation board type is Mixer.Try searching with HMC553 to find RF Board variants.The mount is attached to PCB.
109952-HMC553LC3B Features
0 pins Mixer Type
109952-HMC553LC3B Applications
There are a lot of Analog Devices Inc. 109952-HMC553LC3B RF Boards applications.