大型星载Ku波段波导缝隙阵列天线—宽频带设计及热变形分析  

Wideband Design and Thermal Deformation Analysis of Space-borne Large Waveguide Slots Array Antenna in Ku-band

作　　者：刘世华[1,2] 王宏建[1] 郝齐焱 易敏 陈雪[1] 刘广[1] 

机构地区：[1]中国科学院国家空间科学中心微波遥感技术重点实验室,北京100190 [2]中国科学院大学,北京100049

出　　处：《空间科学学报》2013年第2期207-212,共6页Chinese Journal of Space Science

基　　金：国家高技术研究发展计划项目(2011AA812417B);中国科学院空间科学与应用研究中心前研创新项目(O72118AA8S)共同资助

摘　　要：高度计波导缝隙阵列天线是高增益、低副瓣天线子系统,其宽频带、窄波束等特点对天线设计将提出较高要求.天线阵面较大,在空间环境冷热交替的作用下会发生形变,因此,有必要研究形变对天线电性能的影响.本文采用天线阵分区馈电、波导中心馈电以及加载元件等技术,解决了天线宽频带设计问题,并针对热变形问题,提出一种分析天线热变形对其电性能影响的新方法.现已加工出8×10阵列天线实验件,实测结果表明,1.3以下驻波带宽为340 MHz,E面副瓣电平为-25.9 dB,H面副瓣电平为-27.2 dB,满足实际要求,验证了设计方法的有效性.Waveguide slots array antenna was adopted in engineering project. Though this antenna had high gain, low side lobe etc, wideband requirement was a big challenge for it. As working in the space environment, large space-borne antenna would be influenced by the thermal deformation. It was necessary to analyze the influence on electrical performance, such as radiation pattern. In order to enlarge the band, antenna was separated into four areas to feed, and the feeding point was in the center of the waveguide. Special loads were exerted in waveguide H-T and E-T junctions to meet impedance matching. An approximate computation method was provided to analyze the influence of the thermal deformation on antenna performance. Some 8 × 10 slots array antennas were manufactured as the first step, and these antennas were tested in our near field testing system. The bandwidth of the Voltage Standing Wave Ratio （VSWR） below 1.3 was 340 MHz, and the side lobe level was -25.9dB in E plane and -27.2dB in H plane. Measurement result indicated the availability of the designe.

关 键 词：星载 波导缝隙 阵列天线 热变形 宽频带 

分 类 号：V443.4[航空宇航科学与技术—飞行器设计]