内置介质板的开孔箱体屏蔽效能电磁拓扑模型

发布时间：2018-05-13 22:05

本文选题：屏蔽效能 + 电磁拓扑理论　；参考：《电工技术学报》2017年09期

【摘要】：针对内置介质板的开孔矩形金属箱体的特点,基于电磁拓扑(EMT)理论和BLT方程,建立任意平面波照射下箱体屏蔽效能的EMT模型,推导近似计算解析式,并分析介质板的厚度、材料和位置及平面波的极化角和入射角等因素对屏蔽效能的影响。结果表明:加装介质板可有效抑制箱体谐振,显著提高谐振点附近的屏蔽效能,但对远离谐振点频域的屏蔽效能影响不大;介质板厚度越大,屏蔽效能越高;不同谐振点处存在最佳电导率和最佳相对介电常数,使得谐振的抑制作用最强,屏蔽效能最高;介质板置于箱体前端比后端屏蔽效能高;不同谐振点处屏蔽效能的最大值在不同的介质板位置处取得;平面波的极化角越大,入射方位角越大,仰角越小,屏蔽效能越高。计算结果与仿真结果一致,证明了该文建立的EMT模型的有效性。该方法较等效传输线法(TLM)计算精度更高,尤其是在高频范围;较数值方法和全波仿真计算方法速度更快。该文工作对屏蔽箱体的设计具有指导意义。
[Abstract]:Based on the theory of electromagnetic topology and BLT equation, the EMT model of shielding efficiency of box under arbitrary plane wave irradiation is established, and the approximate analytical formula is derived, and the thickness of dielectric plate is analyzed, according to the characteristics of the rectangular metal box with an opening hole with a built-in dielectric plate, and based on the theory of electromagnetic topology and BLT equation, the shielding efficiency of the box is derived. The influence of material and position, polarization angle and incident angle of plane wave on shielding efficiency. The results show that the addition of dielectric plate can effectively suppress the resonance of the box and significantly improve the shielding efficiency near the resonance point, but has little effect on the shielding efficiency far away from the resonance point in frequency domain, and the greater the thickness of the dielectric plate, the higher the shielding efficiency. The optimum conductivity and the best relative dielectric constant exist at different resonance points, which make the resonance have the strongest restraining effect and the highest shielding efficiency, and the dielectric plate is more effective than the back shield in the front end of the box. The maximum shielding effectiveness at different resonance points is obtained at different dielectric plate positions. The larger the polarization angle of the plane wave is, the greater the incident azimuth is, and the smaller the elevation angle is, the higher the shielding efficiency is. The calculated results are consistent with the simulation results, and the validity of the proposed EMT model is proved. This method is more accurate than the equivalent transmission line method (TLM), especially in the high frequency range, and is faster than the numerical method and the full-wave simulation method. The work of this paper is of guiding significance to the design of the shield box.
【作者单位】：华北电力大学电气与电子工程学院;
【基金】：国家自然科学基金(61372050) 中央高校基本科研业务费专项基金(2016MS06)资助项目
【分类号】：TN03

【相似文献】