一种具有陷波特性的Vivaldi天线设计  

Design of a band notched Vivaldi antenna for UWB applications

作　　者：涂升[1] 焦永昌[1] 宋跃[1] 张福顺[1] 张铮[1] 

机构地区：[1]西安电子科技大学天线与微波技术国防科技重点实验室,陕西西安710071

出　　处：《电波科学学报》2010年第2期383-388,共6页Chinese Journal of Radio Science

摘　　要：提出了一种具有陷波特性的新型超宽带Vivaldi天线。采用双Y巴伦实现了微带-槽线过渡,利用多阶阻抗变换器解决了宽带阻抗匹配问题。通过在微带线上添加狭缝,实现了对WLAN应用频段（5.125~5.825 GHz）的隔离,使该天线具有陷波特性。在仿真设计的基础上制作了实验模型,并对其进行了测量。实测结果表明：在超宽带UWB（Ultra Wide-Band）应用频带（3.1~10.6 GHz）范围内,除隔离频带（5.1~6.0 GHz）以外,该天线的驻波比VSWR≤2,辐射方向图定向性较好,且交叉极化较低,从而证明了该天线设计的实用性。A novel Vivaldi antenna for UWB applications is proposed in this paper.The wide impedance bandwidth,from 3.1 to 10.6 GHz,is realized by using a quarter-wave impedance transformer of 3 steps combined with a double-Y balun for microstrip/slotline transition.Meanwhile,by inserting slot onto the strip-line,a suitable notched band has been obtained,which is from 5 to 6 GHz for the WLAN applications.The experiment prototype is fabricated and measured.Both the simulated and measured results demonstrate that the voltage standing wave ratios（VSWRs） of the proposed antenna are less than 2 over the UWB band except the notched band 5.1~6.0 GHz.The antenna has good directional radiation patterns and low cross polarization ratios,which indicates the practicability of this antenna for UWB applications.

关 键 词：超宽带 VIVALDI天线 微带-槽线过渡 陷波特性 

分 类 号：TN822.8[电子电信—信息与通信工程]