低PIM吸波箱中SiC/C泡沫吸波结构的仿真设计及测试验证  

Simulation design and test verification of SiC/C foam absorbing structure in low PIM absorbing box

作　　者：秦家勇[1] 李处森[2] 林立海 徐东生[2] 杜春林[1] 解峥[1] QIN Jiayong;LI Chusen;LIN Lihai;XU Dongsheng;DU Chunlin;XIE Zheng(Beijing Institute of Spacecraft Environment Engineering,Beijing 100094,China;Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]北京卫星环境工程研究所,北京100094 [2]中国科学院金属研究所,沈阳110016

出　　处：《航天器环境工程》2024年第6期714-720,共7页Spacecraft Environment Engineering

基　　金：中国空间技术研究院自主研发项目(编号:Y941L601J1)。

摘　　要：为研制适用于热真空环境的低无源互调(PIM)吸波箱,进行PIM问题试验及方案验证,基于吸波箱内的近场吸波状态,建立与实物结构尺寸一致的箱体和螺旋收/发天线电磁仿真模型,引入吸波箱用SiC/C泡沫吸波材料在-100℃、室温和100℃下的介电常数,通过电磁仿真计算确定了SiC/C泡沫吸波材料在吸波箱内壁的尖锥-底板一体化高效吸波结构,并据此对吸波材料进行形状加工。在金属箱内完成吸波材料一体化结构装配后,对该吸波箱在-90℃至100℃高低温循环热真空环境中的PIM性能进行测试。结果显示,整个测试过程中天线接收的PIM信号功率不高于-160 dBm,与吸波箱模型仿真结果一致,满足低PIM性能使用要求,可为其他类型吸波箱或实星考核大型PIM吸波箱用吸波材料的结构设计提供参考。This paper aims to develop a low passive intermodulation(PIM)absorbing box suitable for thermal vacuum environments and to verify its performance through PIM testing.An electromagnetic simulation model was established for the box and helix antennas based on the near-field absorption state inside the box.According to the dielectric constants of SiC/C foam absorbing materials at-100℃,room temperature,and 100℃,through electromagnetic simulation calculation,the design of a cone-bottom integrated high-efficiency absorbing structure on the box’s inner wall was determined.The absorbing material was shaped accordingly and assembled within a metal box.The PIM performance of the box was evaluated under thermal cycling from-90℃to 100℃in a vacuum.The results indicate that the PIM signal power received by the antenna remained belowx-160 dBm throughout the test,in agreement with the simulation results.This meets the low PIM performance requirement.The research provides a reference for the structural design of absorbing materials in other absorbing box types or larger PIM-absorbing boxes for satellite evaluation.

关 键 词：无源互调 碳化硅/碳泡沫吸波材料 吸波箱 近场吸波 宽温区吸波 

分 类 号：V416.8[航空宇航科学与技术—航空宇航推进理论与工程] V443.4[一般工业技术—材料科学与工程] V250.3[航空宇航科学与技术—航空宇航制造工程]