超宽带三维频率选择表面  

Ultra-Wideband Three-Dimensional Frequency Selective Surface

作　　者：陈昭冉 姚夏元 CHEN Zhaoran;YAO Xiayuan(School of Electrical and Electronic Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学电气与电子工程学院,北京102206

出　　处：《人工晶体学报》2023年第11期1971-1979,共9页Journal of Synthetic Crystals

摘　　要：相较于传统的二维频率选择表面,三维频率选择表面能产生更多谐振点而提供更大带宽,更容易达到小型化的要求,能够提供更稳定的频率响应,因而成为研究热点。本文提出了一种多级正交菱形结构的新型三维频率选择表面,其基本单元结构是正交的菱形金属丝,在其外部注入介电常数为2.2的聚合物作为支撑。入射角在0°~50°的条件下具备9.2 GHz共同带宽,相对带宽超过50%,TE和TM极化的最大插入损耗皆不超过1 dB。该结构具备三个谐振点,形成原因分别为正交菱形金属结构的谐振、结构和介质端面相互耦合产生的谐振,以及介质端面的一阶法布里-珀罗谐振。通过调节介质的介电常数,可利用更高阶的法布里-珀罗谐振进一步设计出通宽更宽的空间滤波器。考虑到工程应用,文中也评估了此设计对天线远场方向图的影响。Compared to traditional two-dimensional frequency selective surfaces,three-dimensional frequency selective surface has become a hot research direction due to its ability to generate more resonance points,provide larger bandwidth,efficiently meet miniaturization requirement,and bring more stable frequency response.A novel three-dimensional frequency selective surface with a multi-level orthogonal diamond structure is proposed in this paper.Its basic unit structure is an orthogonal diamond-shaped metal wire,and a polymer with dielectric constant of 2.2 is injected externally as support structure.The common bandwidth of this frequency selective surface exceeds 9.2 GHz with a relative bandwidth exceeding 50%,and the average insertion loss of TE and TM polarization does not exceed 1 dB when the incident angle in the range of 0°to 50°.This three-dimensional frequency selective surface has three resonance points.Their formation reasons are the resonance of the orthogonal diamond metal structure,the resonance generated by the coupling between the structure and the dielectric end face,and the first-order Fabry Perot resonance of the dielectric end face.If the dielectric constant of the filling medium is adjusted,higher order of Fabry Perot resonance can be utilized,and a spatial filter with broader bandwidth requirement can be designed.At the same time,the impact of this three-dimensional frequency selective surface on the far-field pattern of the antenna is also evaluated.

关 键 词：三维频率选择表面 超宽带 角度稳定 低损耗 法布里-珀罗谐振 空间滤波器 

分 类 号：TN802[电子电信—信息与通信工程] TN713