高阻抗表面对宽带蝶形天线辐射性能的改善  

Radiation Pattern Improvement of Wideband Bowtie Antenna Using High Impedance Surface

作　　者：孟宪锟[1,2] 李超[1] 方广有[1] 

机构地区：[1]中国科学院电子学研究所,北京100190 [2]中国科学院研究生院,北京100049

出　　处：《科学技术与工程》2010年第20期5062-5066,5081,共6页Science Technology and Engineering

摘　　要：研究利用高阻抗表面改善宽带蝶形天线的辐射性能。通过对高阻抗表面的单元结构进行等效电路分析和全波电磁仿真分析,定量表征高阻抗表面的同相反射频带与其单元结构参数的关系。在此基础上,将优化设计的高阻抗表面加载到宽带蝶形天线中,并对加载前后的天线性能进行仿真分析和比较。结果表明:加载高阻抗表面后,蝶形天线方向图后瓣得到明显抑制,13%的相对带宽内天线增益提高了2.7dB。由于高阻抗表面的同相反射特性,加载时可紧贴于蝶形天线背面,整体结构简单紧凑。研究结果在探地雷达等宽带系统中具有很好的应用前景。The aim of this paper is to investigate how the performance of a broadband bowtie antenna could be improved by a high impedance surface（HIS）.Both the equivalent circuit analysis and the full-wave simulation are performed to quantitatively describe the relationship between the in-phase reflection band and the parameters of HIS structure.Then,a broadband bowtie antenna loaded with an optimized HIS was designed and its performance was simulated and compared with the original antenna without HIS.It＇s found that,by appropriately loading the HIS,the back lobes of the antenna were obviously reduced,with its gain increased about 2.7 dB over 13% relative bandwidth.By the advantage of the in-phase reflection property,a HIS can be placed exactly at the backside of a bowtie antenna,making the whole structure very simple and compact.The method has potential applications in lots of broadband systems,such as the ground penetrating radars（GPR）.

关 键 词：电磁带隙结构 高阻抗表面 探地雷达 蝶形天线 

分 类 号：TN82[电子电信—信息与通信工程]