一种强互耦阵列天线的校正方法

Vivaldi天线因具备优异的宽带扫描性能,被广泛应用于雷达、无线通信、测向系统等领域.由于Vivaldi天线单元组阵后存在强电磁耦合作用,使阵列方向图失真引起波束指向偏差,影响测角精度.针对相控阵天线单元间由于互耦引起阵列方向图失真,导致阵列天线波束指向产生偏差这一问题,提出了一种基于最小二乘互耦矩阵的相位校准方法对波束指向进行校正,最后采用了一组X波段的16单元Vivaldi阵列天线进行仿真实验.仿真实验结果表明,针对Vivaldi天线阵列在强互耦情况下波束指向存在偏差这一问题,该校正方法可以对该阵列天线波束指向偏差进行有效校正,为工程应用奠定了理论基础.

A Correction Method of Strong Mutual Coupling Array Antenna

Vivaldi antennas are widely used in radar, wireless communication, direction finding systems and other fields due to their excellent broadband scanning performance. Due to the strong electromagnetic coupling after the Vivaldi antenna unit is arrayed, the array pattern is distorted, causing the beam pointing deviation, which affects the accuracy of angle measurement. Aiming at the problem of the distortion of the array pattern due to mutual coupling between phased array antenna elements, which leads to the deviation of the array antenna beam pointing, a phase calibration method based on the least squares mutual coupling matrix is proposed to correct the beam pointing. A set of 16-element X-band Vivaldi array antennas were used for simulation experiments. The simulation experiment results show that the method in this paper can effectively correct the beam pointing deviation of the Vivaldi antenna array in the case of strong mutual coupling, laying a theoretical foundation for engineering applications.