摘要
从理论上研究了手征负折射平行板波导中的导模特性,给出了几个低阶导模的色散关系曲线和场分布、功率流分布。发现了一些新的特性:当手征参数较大发生负折射时基模缺失且色散曲线发生下凹;截止频率不再是传统定义中的纵向传播常数为零时所对应的频率,而是导模可以传播的最小频率;波导中存在后向波,总的功率流与波矢方向相反。
The characteristics of guided modes in chiral negative parallel-plate waveguide are investigated theoretically. The dispersion curves, electromagnetic field and power flow distributions of some low-order guided modes are plotted, and some novel characteristics are found： The fundamental guided mode will disappear and the dispersion curves will bent down when the negative refraction appears due to big chirality parameter, and when longitudinal propagation constant is zero, the cut-off frequency is no longer the conventionally defined frequency but the minimum frequency that guided mode can propagate. Finally the backward wave exists in the chiral negative parallel-plate waveguide, and the total power flow is in the opposite wavenumber direction.
出处
《电波科学学报》
EI
CSCD
北大核心
2008年第4期597-600,628,共5页
Chinese Journal of Radio Science
基金
国家重点基础研究发展计划资助项目(2004CB719805)
国家自然科学基金资助项目(60777037)
宁波大学教授
博士基金资助项目
关键词
负折射
手征
平行板波导
截止频率
negative refraction
chirality
parallel-plate waveguide
cut-off frequency
