There are 0 pins on this high power RF circuit board.The Evaluation board type is Amplifier.Try searching with HMC453 to find RF Board variants.The mount is attached to PCB.
109942-HMC453ST89 Features
0 pins Amplifier Type
109942-HMC453ST89 Applications
There are a lot of Analog Devices Inc. 109942-HMC453ST89 RF Boards applications.