大口径宽带数字延时相控阵天线

不同于窄带相控阵天线,空间色散和时间色散是大口径宽带相控阵天线需要解决的2个主要问题。文章采用了子阵加数字延时滤波器的整体结构设计,把大口径阵列划分为很多个较小口径的子阵,并采用传统窄带相控阵天线加权方法,完成子阵的波束合成;子阵间的波束合成,则采用数字延时滤波器实现。在介绍了子阵划分方式的基础上,对延时滤波器的时域设计方法进行了阐述和分析。通过延时滤波器仿真,证明了滤波器设计方法的正确性;通过系统方向图仿真,证明了子阵加数字延时滤波器的设计方法,克服了空间色散和时间色散问题。

The large aperture wideband phased array antenna

In contrast to narrow band phased array antenna, spatial dispersion and time dispersion are two dominant issues faced by the large aperture wideband phased array antennas. In this paper, the integral structure design of the subarray and digital delay filter was adopted. Firstly, the large aperture array was divided into a number of smaller size subarrays, and each of them was considered as a traditional narrow band phased array. Then, the beam forming between the subarrays was realized through digital time delay filter. After subarray partition, delay filter design in time domain was described and analyzed. Simulation results of time delay filter validate the correctness of the proposed filter design. Furthermore, system simulations prove that the hybrid structure with subarray and delay filter is able to overcome the spatial dispersion and time dispersion problems.