低PIM吸波装置的设计与性能测试

Design and performance test of a low PIM absorber

为了解决在空间环境模拟器(简称“容器”)内开展无源互调(Passive Intermodulation,PIM)测试的技术难题,验证温度变化对航天器系统级PIM性能的影响,需要在容器内建立一个低PIM的吸波环境。即在容器内安装一种封闭的低PIM吸波装置,使星上被测无源器件完全被其包敷,然后通过模拟温度应变过程完成测试工作。文章介绍了PIM指标小于-150 dBm的低PIM吸波装置的设计思路和常压热循环测试过程,并对测试结果进行了分析,确定该吸波装置PIM性能满足试验测试要求。

In order to meet the requirement of the passive intermodulation(PIM)testing in a space environmental simulation chamber and to study the impact of the temperature changes on the performance of the spacecraft system-level PIM,a low-PIM absorbing environment has to be established in the chamber.The method adopted in this paper is to install a low PIM wave absorbing device in the chamber,so that the passive devices under the test is completely covered by it,and then the testing is completed by simulating the temperature strain process.The design philosophy and the atmospheric thermal cycling test process of the low-PIM absorber with a PIM index less than-150dBm are described.The testing results are analyzed,and the PIM performance of the absorber is shown to be able to meet the test requirements.