微波暗室静区性能评测及不确定度分析  

The Quiet Zone Performance Evaluation of the Microwave Anechoic Chamber and the Uncertainty Estimation

作　　者：刘潇[1] 赵兴[1] 洪力[1] 李昱瑶 班浩 LIU Xiao;ZHAO Xing;HONG Li;LI Yuyao;BAN Hao(National Institute of Metrology,Beijing100029,China)

机构地区：[1]中国计量科学研究院,北京100029

出　　处：《计量科学与技术》2022年第4期89-94,共6页Metrology Science and Technology

基　　金：国家市场监督管理总局能力提升项目(ANL1906);中国计量科学研究院基本科研业务费项目(27-AKYZD2016)。

摘　　要：微波暗室广泛用于天线、目标散射特性测量、雷达成像等领域,是微波频段最重要的测试场地之一。微波暗室建设投入较高,其静区性能取决于其内壁铺设的吸波材料特性及其布置,静区指标直接影响使用该暗室测试的设备测量结果准确度。因此如何测量得到准确的微波暗室静区指标是微波暗室验收中必不可少的环节,也是微波暗室环境对测量结果贡献评估的基础。针对微波暗室静区的关键指标——静区反射率电平的测量方法进行研究,针对中大型微波暗室,建立最大行程4 m的基于三维扫描架的静区测量系统,覆盖频率范围1~40 GHz。利用其开展微波暗室静区的测量,给出静区反射率电平的测量结果,并进行了测量系统影响量的全面分析和测量结果不确定度评定。结果表明,以1.1 GHz为例,该系统静区反射率电平在−33 dB的情况下,测量不确定度为1.72 dB(k=2)。Microwave anechoic chamber is one of the most important test sites in the microwave band,which is widely used in antenna measurements,target scattering parameter measurements and radar imaging.The investment construction of the microwave anechoic chamber is relatively high,and the quiet zone performance of the chamber depends on the characteristics and layout of the absorbing materials laid on its inner wall,while the quiet zone parameter of the chamber is closely related to the measurement accuracy of the devices measured in the chamber.Therefore,acquiring the accurate anechoic chamber quiet zone parameter through measurements not only is an essential step for the site validation,but also the basis for estimating the contribution of the anechoic chamber environment to the measurement results.The method to measuring the quiet zone reflectivity level of the chamber,which is the key parameter of the quiet zone,is discussed in this article,and a quiet zone measuring system based on a three-dimensional scanner with a maximum travel of 4 m is established for medium-to-large microwave chamber covering the frequency range of 1 to 40 GHz.An example of reflectivity level measurement for an anechoic chamber is presented,the measured results are shown,and the uncertainties component which effect the results are discussed,and the total uncertainty for the quiet zone reflectivity level is estimated for the first time.The results show that the expanded uncertainty is 1.72 dB(k=2)at 1.1 GHz for reflectivity level of−33dB.

关 键 词：微波暗室 静区 反射率电平 测量不确定度 

分 类 号：O441.4[理学—电磁学]