波导中开口谐振环的实验研究

The Experimental Study of Split Ring Resonator in Waveguide

金属开口谐振环(split ring resonators,SRRs)是组成负磁导率结构材料的基本结构单元。本文利用波导法系统地研究了六边形SRRs的微波透射、吸收以及传输相位随频率的变化特性。实验结果表明:单个SRRs的谐振频率随内外环间距的增加而减小,且传输相位在谐振频率处发生跃变;两个SRRs间的相互作用随其间距的变化而变化,即谐振频率随间距的增加而增加,且在谐振频率处吸收出现最大值;多个以一定间距排列的SRRs列的电磁谐振行为可由环的开口大小调控,且谐振频率随开口间距的增加而增加。SRRs电磁谐振行为的研究对于左手材料的制备具有一定的指导意义。

The split ring resonators （SRRs） are the unit cells of negative permeability metamaterials. We used a rectangular waveguide method to systematically investigate the transmission, absorption, and transmission phase of the hexagon SRRs. The results show that the resonance frequency of an individual SRRs decreases with the increase of the radial gap, and the transmission phase has a shift at the resonance frequency. The interaction between two identical SRRs is affected by the distance, and the resonance frequency increases with the distance. The absorption peak occurs near the resonance frequency in the SRRs system. The azimuthal gap can adjust the electromagnetic resonance behavior of the multi-SRRs system, and the resonance frequency increases with the azimuthal gap. The investigation of SRRs is instructive for the preparation of the left - handed metamaterials.