With the rapidly development of intelligent connected vehicle, Security problem is becoming a core concern of vehicle owners. Current vehicle-ground communication related researches mainly focus on wide-beam antenna, which may result in data leakage for its wide signal coverage of on-board terminal. In this paper, a novel kind of beam scanning array which can be used for security enhancement of intelligent connected vehicles is proposed. This new kind of array is composed of a beam controller which based on the Butler matrix and a four-cell patch, which can not only reduce the power consumption of on-board terminal but also can enhance the security performance of V2X DATA link. This new array is characterized with lightweight, low profile, and low cost. Good performance of the on-board array can be observed in the simulation results.