提出一种用于X波段的64单元相控阵天线的实时延迟线系统。采用压电陶瓷(PZT)调节线性啁啾光纤的长度,实时地改变时延的长短。每支延迟线的调节范围为0~350 ps。系统采用8次时延叠加的方法,获取大角度扫描所需的长时延。通过串联、并联和分组交换连接方式,将72支延迟线联成延迟网络。在同一扫描信号控制下,各延迟线能同步的调制出不同的时延,合成相控阵天线波束指向对各个发射单元所需求的时延,扫描方式可以是连续的。相控阵天线应用本系统后,波束扫描角可达±81.2°,天线搜索数据率为115.0次/s。

A system of true-time delay line for an X-band 64 element phased arrays antennas is proposed.The variable delay is achieved by changing the length of a line chirp grated with PZT.The modulation range of the delay line is from 0 to 350 ps.The method for obtaming big value of delay by superpozing eight delays is adopted in order to have big delay for scanning angle.The system of delay is composed of 72 delay lines,which are linked serially or in parallel and group commuation.Every line modulated for its own delay value that is required for different scanning angles upon the same signal of scanning control.The scanning angle of the phased array antenna that is provided with the system is 81.2 degrees and the search data rate is 115.0 /s.

TN958.92