含三维复杂工程细缝金属腔的电磁屏蔽效能评估

方明江; 刘强; 闫丽萍; 赵翔; 周海京

doi:10.11884/HPLPB201830.180047

含三维复杂工程细缝金属腔的电磁屏蔽效能评估

doi: 10.11884/HPLPB201830.180047

方明江^1,,
刘强²,
闫丽萍^1, ,,
赵翔¹,
周海京²

1.
四川大学电子信息学院, 成都 610065
2.
北京应用物理与计算数学研究所, 北京 100088

基金项目:

国家自然科学基金委员会-中国工程物理研究院联合基金项目 NSAF-U1530143

详细信息

作者简介:
方明江(1992—)，男，硕士，研究方向为电磁兼容; fangmingjiang@outlook.com

通讯作者:
闫丽萍(1972—)，女，教授，主要从事电磁兼容建模分析和电磁效应评估方面的研究; liping_yan@scu.edu.cn

中图分类号: O441.4
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- 文章访问数: 1058
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- 被引次数: 0
出版历程
- 收稿日期: 2018-01-30
- 修回日期: 2018-04-02
- 刊出日期: 2018-07-15

Evaluation of electromagnetic shielding effectiveness for metallic enclosure with three-dimensional complex thin slots

1.
Department of Electronic and Information Engineering, Sichuan University, Chengdu 610065, China
2.
Institute of Applied Physics and Computational Mathematics, Beijing 100088, China

摘要

摘要: 复杂工程细缝为金属腔电磁屏蔽效能的评估带来了挑战。采用时域有限差分(FDTD)法结合环路(CP)法，在不改变原有粗网格剖分的基础上，实现了对三维复杂细缝结构金属腔电磁屏蔽效能的快速计算。提出复杂工程细缝的等效模型，提高了复杂细缝结构的CP编程和计算效率，计算结果与采用精细网格剖分的传统FDTD(fine-FDTD)计算结果吻合很好，验证了等效模型的有效性。在此基础上，分析了两种开有典型工程细缝金属腔在0~3 GHz内的电磁屏蔽效能，计算结果与fine-FDTD算法结果吻合很好，且计算效率大大提高。
- 屏蔽效能 /
- 工程细缝 /
- 等效模型 /
- 时域有限差分法 /
- CP法
Abstract: Thin slots with complex configurations used in practical engineering make the evaluation of electromagnetic shielding effectiveness(SE) for metallic enclosure increasingly challenging. The contour path (CP) method is adopted to deal with the complex thin slots in order to keep the coarse gridding in FDTD programming. An equivalent model with simple configuration is presented to replace the complex nested slits, and as a result, the programming and calculation efficiency of the CP-FDTD method is improved when dealing with thin slots with complex configurations. The equivalent model and CP-FDTD are used to calculate the SE of metallic enclosure with two typical kinds of thin slot configurations at the wide frequency range respectively. Results are in good agreements with those obtained by using fine-gridded FDTD, and high calculation efficiency is achieved at the same time.
- shielding effectiveness /
- thin slot used in practical engineering /
- equivalent model /
- finite-difference time-domain /
- contour path method

HTML全文

图 1 含有细缝的金属板及细缝区域Yee氏网络剖分示意图

Figure 1. Metallic plane with thin slot calculation model and diagram of Yee's gridding.

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图 2 CP-FDTD计算金属腔中心点SE结果与文献结果的比较

Figure 2. Comparison of shielding effectiveness (SE) at the center of metallic enclosure obtained by CP-FDTD with results in reference

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图 3 含有嵌套细缝的金属腔

Figure 3. Metallic enclosure with nested slit

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图 4 含有嵌套细缝金属腔的屏蔽效能

Figure 4. SE of metallic enclosure with nested slit

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图 5 含有搭接细缝的金属腔及积分路径示意图

Figure 5. Metallic enclosure with covered thin slot

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图 6 含有搭接细缝的金属腔的屏蔽效能

Figure 6. SE of metallic enclosure with covered thin slot

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表 1 不同算例CP-FDTD与fine-FDTD计算效率对比

Table 1. Comparison of computation efficiency between CP-FDTD and fine-FDTD

model	method	enclosure cells	total cells	memory/MB	computation time/min
nested slit	CP-FDTD	9.50×10⁴	5.88×10⁵	40.32	7.00
nested slit	fine-FDTD	1.14×10⁶	2.92×10⁶	174.41	263.67
covered slot	CP-FDTD	8.64×10⁴	5.53×10⁵	38.32	6.91
covered slot	fine-FDTD	2.17×10⁶	5.06×10⁶	291.60	409.51

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参考文献(11)

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