0 pins are on the high power RF circuit board.Input RF type Switch, SPDT of the Evaluation board.Using the HMC547 search parameter, you can discover variants of the RF Board.PCB is the one that mounts RF Board.
EVAL01-HMC547LC3 Features
0 pins Switch, SPDT Type
EVAL01-HMC547LC3 Applications
There are a lot of Analog Devices Inc. EVAL01-HMC547LC3 RF Boards applications.