0 pins are on the high power RF circuit board.Input RF type Amplifier of the Evaluation board.Using the HMC452 search parameter, you can discover variants of the RF Board.PCB is the one that mounts RF Board.
110381-HMC452QS16G Features
0 pins Amplifier Type
110381-HMC452QS16G Applications
There are a lot of Analog Devices Inc. 110381-HMC452QS16G RF Boards applications.