混响室法欠模状态屏蔽体屏蔽效能测试技术研究

doi:10.16180/j.cnki.issn1007-7820.2020.04.001

摘要/Abstract

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S₁₁;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S₂₂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。

关键词: 屏蔽壳体, 欠模状态, 混响室, 屏蔽效能, 长线天线, 谐振

Abstract:

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 S₁₁ 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 S₂₂. 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.

Key words: enclosure, undermod state, reverberation chamber, shielding effectiveness, long-wire antenna, resonant

中图分类号:

TN06

彭光辉,周忠元. 混响室法欠模状态屏蔽体屏蔽效能测试技术研究[J]. 电子科技, 2020, 33(4): 1-5.

PENG Guanghui,ZHOU Zhongyuan. Research on Test Techniques for Shielding Effectiveness of Undermoded Enclosure in Reverberation Chamber[J]. Electronic Science and Technology, 2020, 33(4): 1-5.

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实验设备	性能参数
矢量网络分析仪	频率范围300 kHz~18 GHz
混响室	最低使用频率约150 MHz
屏蔽壳体	214 mm×176 mm×250 mm
喇叭天线	频率范围1~18 GHz
单极子天线	长度40 mm, 20 mm
长线天线	长度1.1 m

谐振模式	f/GHz	谐振模式	f/GHz
f₀₂₁	1.806	f₂₁₂	2.03
f₂₀₂	1.842	f₀₂₂	2.082
f₁₂₀	1.843	f₃₀₁	2.186
f₁₀₃	1.925	f₁₂₂	2.197
f₁₂₁	1.938	f₁₁₃	2.105
f₀₁₃	1.985