为了满足在隧道环境中实现高速率、高质量无线通信的迫切需求，研究了适用于隧道环境的高增益天线，提出了利用二元相控阵天线系统提高隧道内信号传输质量的新方法。相控阵天线系统由两个高增益天线单元及一个移相器组成，通过移相器调整其中一个天线单元的相位，使隧道内合成电场的最小值幅值达到最大，提升信号的平均场强。仿真结果表明：与单个天线发射信号相比，在3 000 m隧道轴向传播范围内，相控阵天线系统发射信号合成电场的最低电平最少提升了19.6 dB；与两个天线同时发射信号相比，最低电平最少提升了12.4 dB，取得较好分集优化效果，消除多径效应导致的深度衰落，解决了隧道环境中存在的通信问题。

To meet the urgent need of high-speed and high-quality wireless communication in tunnel environment, the high gain antenna suitable for tunnel environment is studied. A novel approach to improve the transmission quality of signals in tunnel by using two-element phased array antenna system is presented. The phased array antenna system consists of two high gain antennas and a phase shifter. By adjusting the phase of one antenna, the minimum amplitude of the superimposed electric field strength in the tunnel can be maximized, and the average electric field strength of the signals can be increased. The simulation results show that, compared with the signals transmitted by single antenna, the minimum amplitude of the superimposed electric field strength of the signals transmitted by phased array antenna system increases by 19.6 dB at least in the axial propagation range of 3 000 m tunnel, and at least a 12.4 dB augmentation of the minimum electric field strength compared with the signals transmitted by two antennas simultaneously; the system achieves better diversity optimization effect, eliminates the deep fading caused by multipath effect, and solves the communication problem in tunnel environment.