The RF Board is convenient for international shipping since it is packaged in QFN.high power RF circuit boards with 0 pins are designed.RF Type Amplifier from the Evaluation board.Search with HMC921 if you are looking for RF Board variants.The RF Board is mounted by PCB.
131907-HMC921LP4E Features
Packed in QFN 0 pins Amplifier Type
131907-HMC921LP4E Applications
There are a lot of Analog Devices Inc. 131907-HMC921LP4E RF Boards applications.