0 pins are provided on the high power RF circuit board.The Evaluation board has type Downconverter RF.Try searching for HMC621 variants of the RF Board.The mount is provided by PCB.
118871-HMC621LP4 Features
0 pins Downconverter Type
118871-HMC621LP4 Applications
There are a lot of Analog Devices Inc. 118871-HMC621LP4 RF Boards applications.