This part is a kind of semiconductor called AR9271.

Function of this product has Single-Chip 1x1 MAC/BB/Radio/PA/LNA.

Manufacturers : Atheros

Image and pinout :

Some of the text within the PDF file :

Data Sheet November 2011 AR9271 Single-Chip 1x1 MAC/BB/Radio/PA/LNA with USB Interface for 802.11n 2.4 GHz WLANs General Description The Atheros AR9271 is a highly integrated singlechip solution for 2.4 GHz 802.11n-ready wireless local area networks (WLANs) that enables a highperformance 1x1 configuration for wireless station applications demanding robust link quality and maximum throughput and range. The AR9271 integrates a multi-protocol MAC, baseband processor, analog-to-digital and digital-to-analog (ADC/DAC) converters, 1x1 radio transceiver, RF switch, and USB interface in an all-CMOS device for low power and small form factor applications. The AR9271 implements half-duplex OFDM, CCK, and DSSS baseband processing, supporting 72.2 Mbps for 20 MHz and 150 Mbps for 40 MHz channel and I [ ... ]

AR9271 PDF Datasheet Download