混响室法欠模状态屏蔽体屏蔽效能测试技术研究  

Research on Test Techniques for Shielding Effectiveness of Undermoded Enclosure in Reverberation Chamber

作　　者：彭光辉 周忠元[1] PENG Guanghui;ZHOU Zhongyuan(School of Mechanical Engineering,Southeast University,Nanjing 211189,China)

机构地区：[1]东南大学机械工程学院,江苏南京211189

出　　处：《电子科技》2020年第4期1-5,共5页Electronic Science and Technology

基　　金：装备预研基金重点项目(61406190501);航空科学基金(20032669)。

摘　　要：欠模状态下屏蔽壳体内部场分布不均匀,屏蔽效能测量结果与位置相关,因此需要利用探头或单极子天线进行多位置测量,过程繁琐。文中利用长线天线来测量欠模状态下屏蔽壳体屏蔽效能,并与单极子天线测量结果进行比较。在暗室中测量天线自由空间反射系数S 11;在混响室中利用不同天线测量屏蔽壳体的屏蔽效能,并利用S 22分析腔体谐振特性。测量结果表明,长线天线宽频带匹配特性优于单极子天线,测量的屏蔽效能能够更好地反映屏蔽体谐振特性,为屏蔽壳体的屏蔽效能测试评估提供了指南,具有工程应用价值。Due to the non-uniform distribution of electromagnetic field in undermoded enclosure,the measurement results of the shielding effectiveness are related to the position.Therefore,it is necessary to use a probe or a monopole antenna for multi-position measurement which is cumbersome.In this study,the long-wire antenna was used to measure the shielding effectiveness of the enclosure under the undermoded state,and compared with the monopole antenna measurements.The free-space reflection coefficient S 11 of the antenna was measured in anechoic chamber.The shielding effectiveness of the shielding shell was measured by different antennas in the reverberation chamber,and the cavity resonance characteristic was analyzed with S 22.The experiment results showed that the long-wire antenna had better broadband matching characteristic than the monopole antenna,and the measured shielding effectiveness could better reflect the resonant characteristics of the enclosure,which provided guidance for shielding effectiveness evaluation of enclosures and had engineering application value.

关 键 词：屏蔽壳体 欠模状态 混响室 屏蔽效能 长线天线 谐振 

分 类 号：TN06[电子电信—物理电子学]