源嵌入正折射率传输线介质板内的倏逝波和成像特性
Evanescent waves and imaging properties in positive-refractive-index transmission-line slab excited by embedded source
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摘要: 提出了点源嵌入正折射率介质板进行亚波长成像的新方法，分析了位于负折射率媒质里的正折射率介质板内外的电压倏逝波和电压传播波分布。正和负折射率媒质分别由2维未加载传输线和2维加载电感、电容传输线网络组成。微波电路和数值仿真结果都显示由于板内增大的倏逝场，在正折射率介质板的两个界面附近出现了很大的电压幅度，该结果证实了该正折射率介质板透镜能够恢复电压倏逝波，从而提高像的分辨率。Abstract: A novel approach for subwavelength imaging is proposed using a positive-refractive-index(PRI) media slab lens excited by an embedded source. Both evanescent wave and propagating voltage wave distribution are analyzed inside and outside a PRI media slab, which is surrounded by a negative-refractive-index (NRI) material. The PRI and NRI materials consist of two -dimensional unloaded transmission line(TL) and inductor, capacitor (L,C) loaded TL networks, respectively. The microwave-circuit simulation and numerical simulation results show that there is strong voltage amplitudes near the two interfaces of the slab due to the growth of evanescent field in the slab. The results confirm that evanescent waves are restored at the focus by the proposed PRI TL lens, thus enhancing the resolution of th
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Key words:
- loaded transmission line /
- negative refractive index /
- subwavelength imaging /
- slab lens
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