WLAN (Wireless Local Area Network) system is a sophisticated wireless mobile broadband access technology. With the continuous development of the Internet, WLAN system has more and more embodied the advantages of convenient use.
However, due to the lower AP transmit power, the working frequency of 2.4GHz, great transmission loss of wireless signal and poor penetration, the indoor signal coverage of this system in many buildings is uneven, which can not fully meet users' needs. To solve the indoor signal coverage problem of this system, WLAN system is introduced into the indoor signal coverage system in recent years, to expand the coverage area of AP through passive antenna systems, achieving the good and average coverage of WLAN signal.