不等分多齿型VHF/UHF机载天线设计  

Design of the unequal multi-tooth type VHF/UHF airborne antenna

作　　者：孙成杰 曹卫平[1] SUN Chengjie;CAO Weiping(School of Information and Communication,Guilin University of Electronic Technology,Guilin 541004,China)

机构地区：[1]桂林电子科技大学信息与通信学院,广西桂林541004

出　　处：《桂林电子科技大学学报》2018年第4期265-268,共4页Journal of Guilin University of Electronic Technology

基　　金：国家自然科学基金(61361005);广西研究生教育创新计划(YCSW2017138)

摘　　要：为满足VHF/UHF机载天线宽带化、小型化和高增益的要求,设计了一种平衡馈电的带反射腔的机载蝶形天线。采用指数渐变巴伦,以防止同轴线馈电时产生的方向图发生畸变;采用三面镂空金属背腔结构,对天线后向辐射进行有效抑制,提高其增益。仿真与实验测试结果表明,该天线S11≤-10dB带宽范围为200~400MHz,相应的相对带宽为67%,且增益可达4dBi以上,天线尺寸仅为最长工作波长的22%。In order to realize the requirements of wideband,miniaturization and high gain for the VHF/UHF airborne antenna,a balanced fed-flight airborne butterfly antenna with reflective cavity is designed.An exponentially-graded Balun is used to prevent the directional pattern distortion caused by the feeding coaxial line,and a three-sided hollow metal back cavity structure is adopted to suppressing the backward radiation effectively and also increase the gain.The simulated and measured results show that the size of the is only 22% wavelength of the longest operating wavelength,but the impedance bandwidth（S11≤-10 dB）of 67%from 200 to 400 MHz and the gain exceeds 4 dBi.

关 键 词：VHF/UHF机载天线 宽带小型化 蝶形天线 巴伦 金属背腔 

分 类 号：TN82[电子电信—信息与通信工程]