共形异向介质覆层在单极子天线上的应用  

Application of the conformal metamaterial in a monopole antenna

作　　者：翁子彬[1] 焦永昌[1] 王乃彪[1] 

机构地区：[1]西安电子科技大学天线与微波技术重点实验室,陕西西安710071

出　　处：《西安电子科技大学学报》2007年第2期219-221,273,共4页Journal of Xidian University

基　　金：国家自然科学基金项目(60171045)

摘　　要：当点源置于竖直放置的圆柱形低折射率介质(n<1)中时,其射线在竖直面会产生会聚特性而在水平面仍保持全向特性.据此原理,提出由金属柱阵列构成的圆柱共形异向介质覆层,并应用于单极子天线.利用矩量法对覆层的传输特性进行分析,并对基于此种覆层结构的单极子天线进行了实验验证.测试结果表明,该覆层在对单极子E面方向图进行会聚的同时保持H面方向图的全向特性,可使单极子的增益由5.0 dB提高到7.8 dB.A source embedded in a vertically installed cylinder of the low-refractive medium （ n 〈 1） will be concentrated in a narrow cone in the vertical plane and maintain its omni directivity in the horizontal plane. The ideas developed here are applied to the monopole using the conformal metamaterial cover which is composed of metallic cylinder arrays, the transmission properties of this metamaterial is analyzed by the method of moments, and the monopole antenna system based on the metamaterial cover is measured. Results show that the pattern of the monopole becomes more convergent in the E plane and maintains its omni-directivity in the H plane and that the gain of the monopole is increased from 5. 0 dB to 7. 8 dB.

关 键 词：共形异向介质 全向性 低折射率 

分 类 号：TN821.3[电子电信—信息与通信工程]