用改进基函数分析缝隙阵频率选择表面电磁特性  

Using Improved Basis Functions to Analyze Electromagnetic Characteristics of Slotted Frequency Selective Surfaces

作　　者：武振波[1] 武哲[1] 卢新来[1] 

机构地区：[1]北京航空航天大学航空科学与工程学院,北京100083

出　　处：《微波学报》2004年第3期10-13,共4页Journal of Microwaves

基　　金：国家自然科学基金重大研究计划资助项目 (90 30 5 0 2 6 )

摘　　要：提出了一组有效的改进基函数用于分析缝隙阵频率选择表面的电磁传输特性。规则的中心连接和环形两种类型频率选择单元可以划分为直线段和弯曲段 ,切向电场基函数在直线段按照波导模式展开 ,而在弯曲段幅值不变且连续变化。以Y形和六边环形缝隙阵频率选择表面结构作为算例 ,应用较少的基函数和Floquet模预测的频率响应曲线与试验结果吻合得很好 ,与使用传统的基函数相比 ,谐振频率不随Floquet模数的增加而变动 ,具有良好的稳定性 。An efficient set of improved basis functions is proposed. These basis functions are used to approximate tangential electric fields of resonant elements for slot ted frequency selective surfaces. Regular center connected or loop type elements are divided into straight sections and bends. The tangential electric fields of straight sections are expanded in accordance with waveguide modes, and it is co nstant and continuous at the bends. With tripole and hexagonal loop slot arrays as examples, excellent agreement between predicted and experimental results is d emonstrated using only a few number of basis functions and Floquet modes. In con trast to traditional basis functions, resonant frequency is not dependent of how many Floquet modes which are taken into account, has excellent stability, and c omputation time is reduced extremely.

关 键 词：频率选择表面 基函数 波导模式 传输特性 缝隙 频率响应 计算时间 构作 电磁特性 算例 

分 类 号：O441[理学—电磁学]