Wireless Link Blocking Using Phased Array System for Fraudulent Access

Abstract

In the wireless LAN system, the deauthentication on an access point is one of an attack type to be difficult to defend against by software-based method. In this paper, a phased array antenna system with preset control is proposed to be used to block radio signal from the attacking terminal physically. Controlling the phased array is performed by calculating each phase shift analytically in general. However, using calculated shifts classically, the system could have multiple blocking direction. Unintentionally communication termination might be occurred with the control method where the directivity has multiple attenuation angle. Furthermore, actual phase shifter has its own limited shift range and controlled by using digital voltage value from D/A converter. The phased array system, equipped three antennas with shift range 0 to π [rad], and 10 bit step control, covers over the entire circumference to obtain the single block angle is shown in the paper.