子阵级应用延迟线对相控阵天线带宽改善的分析  

Improving Bandwidth of the Phased Array Antennas Based on Sub-array True Time Delayers

作　　者：张蕾[1] 郭陈江[1] 丁君[1] 

机构地区：[1]西北工业大学电子信息学院,陕西西安710072

出　　处：《航空计算技术》2007年第6期65-67,共3页Aeronautical Computing Technique

摘　　要：采用频率无关移相器的相控阵天线的波束指向会随频率发生变化,实时延迟线是提高宽带相控阵天线指向精度的重要方法。分析了平面相控阵天线波束指向随频率改变而产生漂移的现象,理论分析和仿真结果均表明,当频率改变时,平面相控阵天线的波束指向仅在俯仰角面发生漂移,而在方位角的指向不变。详细讨论采用子阵分割技术,并在子阵级别用实时延迟线,单元内采用移相器的混合波束控制技术。结果表明,这种方法可以有效扩展相控阵天线的带宽。The beam pointing of phased array antennas that adopt phased shifter irrelevant to frequency is changed with frequency. The true time delayer （TTD） for wideband phased arrays is an important method to improve the beam-pointing accuracy. In this paper, the excursion of beam pointing versus frequency is analyzed while the planar phased array scanning. It is shown by analysis and simulation that the beam-pointing is just changed in elevation and changed invariably in azimuth plane. The beam - controlling techniques which sub - array division is adopted , the TTD is used in sub - arrays and phased shifter is used in elements ,are discussed in detail. The results shown that the bandwidth of phased array antennas can be expanded effectively.

关 键 词：孔径效应 宽带相控阵天线 实时延迟线 

分 类 号：TN82[电子电信—信息与通信工程]