This part is a kind of semiconductor called STM-2016.

Function of this product has 1800 - 2200 MHz High Linearity Silicon Germanium Active Transmit Mixer.

Manufacturers : Stanford Microdevices

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Some of the text within the PDF file :

Advanced Data Sheet Product Description The Stanford Microdevices’ STM-2016 is a high linearity active mixer for use in a wide variety of communication systems covering the 1800-2200 MHz frequency bands. This device operates from a single 5V supply and provides 9dB of conversion gain while requiring only 0dBm input to the integrated LO driver. The STM-2016 also includes an integrated on chip IF amplifier and is fabricated using silicon germanium device technology. The STM-2016 incorporates internal matching on each RF, IF, and LO port to enhance ease of use and to reduce the number of external components required. The IF and LO ports can be driven differential or single ended. Each broadband port has been designed to minimize performance degradation while operating into highly reactive [ ... ]

STM-2016 PDF Datasheet Download