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基于时间透镜原理实现微波信号时间反演
Realization of microwave wave signal time reversal based on time lens theory
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摘要: 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.Abstract: Time reversal electromagnetics is a new branch of science.The critical factor for the practical implementation of time reversal technique is to obtain time reversed signal efficiently.In this paper,based on the principle of time lens,a method of obtaining timereversed microwave signal is studied.First,according to the principle of time lens,conditions for realizing time-reversed waveform are derived.The process for obtaining time reversed signals is simulated numerically.Then two chirp electromagnetic bang gap（CEBG） structures are fabricated to construct dispersion channels.And a time reversed signal on a 1.5 ns time scale is obtained in experiment. Due to the difference between CEBG and ideal dispersion channel,there exists a distortion in the experiment results,for whitch the reasons are analyzed.
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