低有效介电常数复合材料的聚波特性研究  

Study on Characteristics of Converging-Wave Based on Low Effective Permittivity Metamaterials

作　　者：刘涛[1] 曹祥玉[1] 马嘉俊[1] 王伟[1] 

机构地区：[1]空军工程大学电讯工程学院,西安710077

出　　处：《电子与信息学报》2009年第3期632-635,共4页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(60671001);空军工程大学电讯工程学院博士创新基金(200603);陕西省自然科学基础研究(2005F21);西安市工业攻关项目(GG06020)资助课题

摘　　要：该文通过建立结构模型,分析了辐射源辐射功率密度与有效介电常数和有效磁导率的关系,然后分析了辐射功率密度与此种属性材料介电常数、厚度、辐射源位置及工作频率的关系。结果表明,辐射源辐射功率密度与有效介电常数和有效磁导率的比值成正比关系,相对低的介电常数可以显著改善辐射源前向辐射功率密度,最大辐射功率密度是厚度的周期函数,而与辐射源位置关系不大;获得较大辐射功率密度的工作频带是非常窄的。理论上解释了人工构造的低介电常数材料作为天线覆层提高增益的原因。Through establishing structure model, the relation is presented among radiation power density of radiation source and effective permittivity and effective permeability. Simultaneously, the relations are numerically analyzed between radiation power density and permittivity, thickness, location of radiation source and operation frequency. The results show that radiation power density is directly proportional to the ratio of effective permittivity and effective permeability; relative low permittivity may remarkably improve radiation power density of radiation source; the maximum of radiation power density is the periodic function of thickness, and is less relation with the location of radiation source; the operation frequency band is very narrow in which the radiation power density can obtain larger values. The results may explain the reason theoretically that low permittivity metamaterials as a cover can enhance the gain of antenna.

关 键 词：电磁材料 复合材料 聚波特性 低介电常数 辐射功率密度 

分 类 号：TN804[电子电信—信息与通信工程]