新型电谐振人工异向介质抑制阵列天线单元间互耦

基于电谐振原理和镜像原理设计了一种周期性接地边耦合SRRs(split ring resonators)结构的新型电谐振人工异向介质,进而将该人工异向介质应用于抑制微带阵列天线元间的互耦.与传统微带阵列天线中的用于抑制互耦的电磁结构相比,该人工电磁结构不仅体积小(厚度仅为0·005λ0),而且能获得优异的阵列单元间互耦抑制性能(抑制度达16·8dB).该研究成果表明人工异向介质在高密度高性能微带天线阵列设计中具有良好的应用潜能.     

小型化电谐振人工特异材料研究

详细分析了电谐振人工特异材料设计原理,并结合等效电路模型通过加载等效电感、等效电容和接地等方法,将相同尺寸的工字形结构工作频率从12.21 GHz降到了5.46 GHz,小型化效果明显.该成果不仅对于不同结构人工特异材料小型化设计提供了重要的参考,同时也为设计不同性能、不同工作频率的人工特异材料提供了明确的研究方向和有效的途径.     

Composite metamaterial enabled excellent performance of microstrip antenna array

This paper reports that the split ring resonators and complementary split ring resonators are compounded to construct a novel compact composite metamaterial.The composite metamaterial exhibits a unique property of blocking electromagnetic wave propagating in two directions near the resonant frequency.An example of two-element microstrip antenna array demonstrates that the developed metamaterial enables array performance that is an improvement in comparison with the traditional one,including mutual coupling suppression of 9.07 dB,remarkable side lobe suppression and gain improvement of 2.14 dB.The mechanism of performance enhancement is analysed based on the electric field and Poynting vector distributions in array.The present work not only is a meaningful exploration of new type composite metamaterial design,but also opens up possibilities for extensive metamaterial applications to antenna engineer.     

一种新颖的变异开口谐振环双频带磁谐振特异材料

根据磁谐振等效电路原理,设计出了工作在X波段的基于变异开口谐振环(split ring resonators)结构的新型双频带磁谐振特异材料.由于内外环间具有弱耦合的优越特性,所提出的磁谐振特异材料的两个工作频点可以较为方便地调节.该研究成果为特异材料的多频带、宽带化提供有益的的研究思路和设计方法. 关键词： 磁谐振特异材料 双频带 弱耦合     

Expanding the bandwidth of planar MNG materials with co-directional split-ring resonators

An effective approach to expand the bandwidth of negative permeability of small-sized planar materials is proposed. Based on qualitative analysis of equivalent circuit models, the fractional bandwidth of an μ-negative (MNG) material is expanded from 3.53% up to 12.87% by adding split-ring resonators (SRRs) and arranging them by proposed steps. Moreover, the experimental results validate the effectiveness of bandwidth-expanding methods, which is promising for the extensive application of metamaterials in the microwave field.