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为研究外部电磁能量通过贯通导体耦合对腔体内部屏蔽效能的影响,利用电磁仿真软件FEKO,从频域角度对腔体内部场进行了仿真研究,利用矢量网络分析仪、功率放大器、GTEM室和全向电场探头搭建实验系统进行了验证,并通过建立含贯通导体金属腔体电路模型进行了谐振频率定性分析。结果表明:仿真和实验的结果具有一致性;当加入贯通导体后,腔体的屏蔽效能减小,谐振频率降低。腔体屏蔽效能随着贯通导体数量的增多而减小,随着电场极化方向与贯通导体夹角增大而减小,在腔体谐振频率以下随着监测点到贯通导体位置增大3倍,屏蔽效能提高20 dB。屏蔽效能的谐振频点受贯通导体长度影响较大,随着贯通导体数量增多而减小,不随电场极化方向和监测点位置变化而改变。为了改善含贯通导体金属腔体的屏蔽效能,应注意引入贯通导体后产生的新谐振频点,以及在这些频点上的屏蔽效能极小值,敏感电路应远离贯通导体放置。
In order to study the influence of external electromagnetic energy on the shielding effectiveness of the cavity through the through-conductor coupling, the electromagnetic field simulation software FEKO was used to simulate the internal field in the cavity from the perspective of frequency domain. Using vector network analyzer, power amplifier, GTEM room and The experimental setup of the omnidirectional electric field probe was verified, and the resonant frequency of the resonator was qualitatively analyzed by setting up the circuit model of through-conductor metal cavity. The results show that the simulation and experimental results are consistent. When the through-conductor is added, the shielding effectiveness of the cavity decreases and the resonant frequency decreases. The cavity shielding effectiveness decreases with the increase of the number of through-conductors, decreases with the increase of the angle between the polarization direction of the electric field and the penetration conductor, and increases by 3 times from the monitoring point to the through-conductor position below the cavity resonance frequency , Shielding effectiveness increased by 20 dB. The resonance frequency of the shielding effectiveness is greatly influenced by the length of the through-conductor, decreases with the increase of the number of through-conductors, and does not change with the polarization direction of the electric field and the position of the monitoring point. In order to improve the shielding effectiveness of the metal cavity with through conductors, attention should be paid to introducing new resonance frequencies generated through the conductors and the minimum shielding effectiveness at these frequencies. Sensitive circuits should be placed away from through conductors.