时间反演脉冲电磁波在双负材料中传播特性研究

Propagation characteristics of time reversal pulsed electromagnetic waves in double negative materials

利用全时域电磁仿真技术,对比研究了时间反演脉冲电磁波和脉冲电磁波透过Smith结构双负材料后的时域波形、脉宽压缩以及材料内部空间电场峰值强度分布等时域传播特性.结果表明:时间反演脉冲电磁波在透过双负材料后,在初始源激励处表现出良好的时间和空间聚焦特性.更重要的是,在双负材料内部,观测到了电场峰值强度减弱、截面电场峰值强度趋向均衡分布等新型的物理现象.这些物理现象对发展能够承受大功率新型的双负材料电子器件及其应用系统很有参考研究价值.

With the full time-domain electromagnetic simulation technique,the time-domain propagation properties such as the temporal pulse waveform,the pulse compression and the electric field distribution inside the material are comparably investigated by transmitting the time-reversal pulsed electromagnetic wave and the pulsed electromagnetic wave through the double negative material of the Smith structure,respectively.The results show that after the time-reversal pulsed electromagnetic wave passes through the double negative material,the received electromagnetic wave exhibits remarkable spatial and temporal focusing at the location of the initial excitation. The most interesting physical phenomenon is that the peak values of the electric field inside the double negative material become smaller and tend to be uniform in the magnitude.These novel physical phenomena would be very helpful for developing new electronic devices and systems with double negative materials for the purpose of high power applications.