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采用新型背腔的对数周期缝隙天线
引用本文:刘英, 王伟, 陈玉东, 龚书喜. 采用新型背腔的对数周期缝隙天线[J]. 电波科学学报, 2014, 29(2): 232-236. doi: 10.13443/j.cjors.2013053002
作者姓名:刘英  王伟  陈玉东  龚书喜
作者单位: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;2.北京航空工程技术研究中心,北京 100076
基金项目:新世纪优秀人才支持计划(NCET-11-0690);中央高校基础科研专项资金(K5051202049)
摘    要:针对超宽带雷达探测系统,提出了一款具有定向辐射性能的背腔式对数周期缝隙天线.该天线由一种具有超宽带匹配特性的渐变共面波导馈电.通过在缝隙天线背面设置谐振腔,使缝隙天线具有定向的辐射方向图.根据矩形谐振腔的特点,设计了一种新型结构的谐振腔,使得天线的驻波比(Voltage Standing Wave Ratio, VSWR)小于2.5.仿真与实测结果表明:天线在整个频带(0.9~5 GHz)内具有稳定的定向辐射方向图,新型谐振腔和吸波材料的使用使天线最低工作频率可到0.9 GHz,可使天线在整个频带内得到较高的天线增益.设计的天线适于应用在导航、探测以及超宽带(Ultra-wide Band,UWB)雷达等领域.

关 键 词:对数周期缝隙天线  背腔  超宽带雷达  共面波导
收稿时间:2013-05-30

Log-periodic slot antenna with novel cavity
LIU Ying, WANG Wei, CHEN Yudong, GONG Shuxi. Log-periodic slot antenna with novel cavity[J]. CHINESE JOURNAL OF RADIO SCIENCE, 2014, 29(2): 232-236. doi: 10.13443/j.cjors.2013053002
Authors:LIU Ying  WANG Wei  CHEN Yudong  GONG Shuxi
Affiliation:1.National Key Laboratory of Science and Technology on Antennas and Microwaves,Xidian University, Xi’an Shaanxi 710071, China;2.Beijing Aeronautical Technology Research Center, Beijing 100076,China
Abstract:A cavity-backed log-periodic slot antenna with unidirectional pattern is presented in this paper for UWB radar detection system. The antenna is fed by a special coplanar waveguide (CPW) that is gradual-changed and ultra-wideband matched. In order to make the slot antenna radiate directionally, a cavity is set to the back side of it. To achieve a voltage standing wave ratio (VSWR) target which is below 2.5, a modification is proposed on the basis of rectangle cavity. Both simulated and measured results demonstrate that radiation patterns of the proposed antenna are unidirectional and quite stable within the band. Owing to the novel cavity and application of the absorbing material, the proposed antenna resonates at the lowest frequency point of 0.9 GHz as well as high gain obtained in the full frequency bands. The antenna is suitable for the applications in guidance, detection and UWB radar.
Keywords:log-periodic slot antenna  cavity-backed  ultra-wideband radar  CPW
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