In this paper, theoretical and experimental analysis has been done for the beam transmission of 2.2 GHz RF signal by 1X8 linear phased array antenna fabricated in S-band. The proposed architecture is based on true time delay optical beam forming network which gives squint free beam steering of RF signal. The optical beam forming network is based on chirp fiber Bragg grating (CFBG) and multiple lengths of highly dispersive specialty fiber element. Here, double sideband modulation technique of multiple wavelengths are adopted which explore the reflection property of CFBG with various chirp bandwidth. We measured the reflectivity and time delay response of CFBG, and dispersive fiber elements with theoretical analysis which is verified by experimental results. Theoretical and experimental measurements for the relative time delay was used to investigate the beam radiation pattern of 1X8 phased array antenna through simulation results. Wide range of beam steering ranges $3.5°$ to $18°$ have been achieved when specialty fiber of −100 ps/nm km dispersion coefficient was introduced.

本文对S波段制作的1X8线性相控阵天线对2.2GHz射频信号的波束传输进行了理论和实验分析。所提出的架构基于真正的时间延迟光束形成网络，它提供了射频信号的无斜视光束控制。光束形成网络基于啁啾光纤布拉格光栅 (CFBG) 和多段高色散特种光纤元件。这里采用多波长的双边带调制技术，探索不同线性调频带宽的CFBG的反射特性。我们通过理论分析测量了CFBG和色散光纤元件的反射率和时延响应，并通过实验结果进行了验证。相对时间延迟的理论和实验测量用于通过仿真结果研究 1X8 相控阵天线的波束辐射方向图。宽范围的波束控制范围$3.5°$ 至 $18°$ 当引入 -100 ps/nm km 色散系数的特种光纤时，已经实现了。