气凝胶加载耐高温超宽带复合介质谐振天线  

Ultra-wideband Composite Dielectric Resonant Antenna with Aerogel-loaded High Temperature Resistance

作　　者：陈琦 肖永航 郑承武 程彦清 闵伟桐 CHEN Qi;XIAO Yonghang;ZHENG Chengwu;CHENG Yanqing;MIN Weitong(School of Information Engineering,Southwest University of Science and Technology,Mianyang 621010,China)

机构地区：[1]西南科技大学信息工程学院,绵阳621010

出　　处：《微波学报》2024年第5期39-43,49,共6页Journal of Microwaves

基　　金：西南科技大学自然科学基金资助项目(21zx7126)。

摘　　要：本文介绍了一种应用于高超声速飞行器的气凝胶加载超宽带耐高温复合介质谐振天线。天线基板正上方从下到上依次是介质谐振天线1、介质谐振天线2以及介质透镜,介质透镜与介质谐振天线2之间通过圆介质杆连接,它们都嵌入在气凝胶中。采用微带缝隙耦合馈电结构来激励双层复合介质谐振天线中工作频率相近的工作模式并成功合并,最终天线工作在4.8 GHz~10.4 GHz,相对带宽达到了73.7%。天线采用耐高温介质材料并在结构外加载了耐高温气凝胶,实现了天线与隔热材料的一体化设计,使得天线剖面高度仅为0.76λ0。介质透镜不仅解决了天线方向图主瓣开裂问题,还能有效提升天线增益,增益最大提升1.7 dB,天线在工作频带内最大增益可达9.2 dBi。通过研究分析气凝胶加载情况下天线整体的热传导过程,对天线结构和馈电位置进行了优化调整,进一步提升了天线可工作时长。最终仿真结果表明,天线能在1000℃的高温环境中持续正常工作1280 s,其隔热时间相较于同样大小的气凝胶提升了16%。An aerogel-loaded ultra-wideband high temperature resistant composite dielectric resonant antenna for hypersonic vehicles is presented in this paper.Above the antenna substrate,from bottom to top,is the dielectric resonant antenna 1,the dielectric resonant antenna 2 and the dielectric lens,which are connected with the dielectric resonant antenna 2 by a circular dielectric rod,and they are embedded in the aerogel.A microstrip slot-coupled feed structure is used to excite the working modes with similar frequencies in the double-layer composite dielectric resonant antenna and merge them successfully.The final antenna operates from 4.8 GHz~10.4 GHz,and the relative bandwidth reaches 73.7%.The final antenna works from 4.8 GHz~10.4 GHz,and the relative bandwidth reaches 73.7%.The antenna uses high temperature resistant dielectric material and loads high temperature resistant aerogel outside the structure to realize the integrated design of antenna and heat insulation material,which makes the antenna profile height only 0.76λ0.The dielectric len not only solves the problem of main lobe cracking of antenna pattern,but also effectively improves the antenna gain.The maximum gain can be increased by 1.7 dBi,and the maximum gain of the antenna can reach 9.2 dBi in the working frequency band.By studying and analyzing the overall heat conduction process of the antenna under aerogel loading,the antenna structure and feed position are optimized and adjusted to further improve the working time of the antenna.The final simulation results show that the antenna can work normally in a high temperature environment of 1000℃for 1280 s,and the insulation time is 16%higher than that of aerogel of the same size.

关 键 词：超宽带 耐高温 复合介质谐振天线 一体化 

分 类 号：TN822.8[电子电信—信息与通信工程]