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为研究金属腔体不同耦合途径对腔内电磁耦合的影响,基于时域有限积分方法建立了电磁波辐射条件下金属腔体不同耦合途径计算模型,引入不同耦合途径对比系数评价指标,分析了孔缝、贯通导线两种耦合途径对腔内电磁耦合的影响,采用吉赫兹横电磁波(GTEM)室、矢量网络分析仪等搭建了一种新的耦合试验平台对计算结果进行验证。研究表明:该试验方法准确性好;腔内电磁耦合受孔缝、贯通导线共同作用,开孔腔体加载短贯通导线时腔内耦合主要受腔体谐振影响,加载长贯通导线腔内耦合还受到贯通导线自身谐振影响;频率在153 MHZ以下时贯通导线为主要耦合途径;高频时,若开孔尺寸远大于贯通孔尺寸,腔体谐振频率附近贯通导线为主要耦合,贯通导线自身谐振频率附近贯通导线也为主要耦合途径,其他频点处孔缝为主要耦合途径。
In order to study the influence of different coupling ways of metal cavity on the electromagnetic coupling in cavity, a calculation model of different coupling paths of metal cavity under electromagnetic radiation was established based on the finite-integral in time-domain method. The evaluation index of contrast coefficient by different coupling ways was introduced, , The effects of the two coupling paths through the conductor on the electromagnetic coupling in the cavity, a new coupling test platform is built by means of a GTEM chamber, a vector network analyzer and the like, and the calculation results are verified. The results show that the experimental method has good accuracy. The intracavity electromagnetic coupling is affected by hole seams and through-conductors. When the perforated cavity is loaded with short through conductors, the coupling in the cavity is mainly affected by cavity resonance. The long- Which is affected by the self-resonance of the through-going wire. When the frequency is below 153 MHZ, the through-wire is the main coupling path. If the size of the hole is much larger than the through-hole size at high frequency, the through- Through the wire near the main coupling path, the other frequency points at the main crack coupling.