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时间反演电磁学是一门新兴学科.高效的电磁时间反演信号获取方式是时间反演技术获得应用的关键.本文研究了一种基于时域成像原理获得时间反演微波信号的方法.首先根据时间透镜原理,推导出了实现波形时间反演的条件,并对波形反演的过程进行了数值仿真.然后设计了两种满足反演条件的啁啾电磁带隙结构来构造色散信道,并通过实验得到了一个时隙长度为1.5 ns的时间反演信号.由于啁啾电磁带隙结构与理想色散信道的差异,实验结果中存在波形失真.文章最后对造成失真的原因进行了分析.
Time reversal electromagnetism is a new discipline.Efficient method of acquiring electromagnetic time inversion signal is the key to the application of time reversal.This paper studies a method of time reversal microwave signal based on time-domain imaging principle.First, According to the principle of time lens, the condition of realizing waveform time inversion is deduced, and the process of waveform inversion is numerically simulated.Secondly, two kinds of chirp electromagnetic bandgap structures which satisfy the inversion conditions are designed to construct dispersion channel A time-lag signal of 1.5 ns in time slot was obtained by experiment.Due to the difference between the chirped electromagnetic band-gap structure and the ideal dispersion channel, the waveform distortion exists in the experimental results.Finally, the cause of the distortion is analyzed.