平面型金属-电介质光子带隙结构的表面电磁波传输特性

Transmission of Surface EM Waves in a Planar Metallic-Dielectric Photonic Band-Gap Structure

研究了一种平面型金属 电介质光子带隙结构的表面电磁波传输特性。该材料利用常规的印刷电路板技术制作 ,其金属单元的平面斑图 (pattern)分别为六角形和方形两种 ,空间层状结构为二层与三层两种。在 1～2 0GHz范围内对TE表面波传输情况进行了测试 ,观察到了TE表面波的能隙结构。不同结构的测试结果表明 ,三层结构的材料具有较低的禁带中心频率。用局域电感 电容模型定型解释了本文的实验结果。

An experimental study of surface EM waves in a planar metallic-dielectric photonic band-gap structure (PBG) made by printed circuit board technology is presented. The pattern of metallic island in PBG is quadrate and hexagonal with the two-layer and three-layer structure. The TE wave transmission is measured from 1GHz to 20GHz and the band-gap structures have been observed. The experiments show that, comparing to the two-layer structure, the PBG with three-layer structure have lower frequency of band-gap center. Our observation can be explained qualitatively in an effective local inductance-capacitance model.