有孔箱體的電磁屏蔽分析

有孔箱體的電磁屏蔽分析

摘要：通過對電磁干擾、屏蔽及有孔箱體的實際屏蔽進行了系統(tǒng)全面地介紹。列舉電磁干擾的幾條主要危害，讓人們認識到防電磁干擾的重要性，從而具體深入地研究防電磁干擾的重要方法——屏蔽。本文的研究重點是對電小孔的耦合理論進行了總結(jié)，給出了計算具有電小孔的無限大金屬導(dǎo)體板屏蔽效能的1般計算方法，討論和分析了在平面波源情況下，橢圓孔導(dǎo)體板對磁場的屏蔽特性，并用計算機模擬作圖，根據(jù)圖象具體分析其屏蔽特性。并將同面積的矩形孔進行對比。分析了不同情況下各種形狀的優(yōu)越性，對設(shè)計具有1定的指導(dǎo)意義。另外還模擬了相同面積情況下圓形與正方形的屏蔽特性曲線，并將它們進行分析與對比。還綜合分析了不同形狀的孔的屏蔽特性的相似點。最后將相同面積的孔陣與孔進行對比，介紹孔陣的優(yōu)越性。并結(jié)合機箱的實際孔縫情況，對機箱的電磁屏蔽做了較全面的介紹。

關(guān)鍵詞：電磁干擾；電磁耦合；屏蔽效能；孔；孔陣；金屬導(dǎo)體板 

Analysis of Electromagetic Shielding of cavity with Aperture
 
Abstract: This paper recommends. Electromagetic interference、shielding and the pragmatic shielding of cavity with aperture roundly and systemtically. The paper enumerates several main damage of electromagetic interfernence andd then inputs an important method of fighting against the electromagetic interference—shielding. This paper summarizes the theory dealing with electromagnetic penetration through electrical small aperture in conducting surfaces. A general method for calculating shielding effectireness of infinite metallic plale with small aperture is investigated. The case of plane wave soure is computed and the effects of ellipse aperture on shielding effectiveness are discussed, and use the computer to simulate the graph, and then analyse the shielding characteristic concrelely according to the graph. Through contrasting with the same area of rectangle aperthre, analysed the superiority of different shape apertures. This has some guilding significance to design. Besides simulating the graph of the shielding characteristics curve of the same area square and circular, we examines the resemblances of different shape apertures through contrasting the graphes. Finally, we contrast the same area of aperture and the aperture arrays, then presents the advantage superiorily of the aperture arrays. Integrating the practical situation of carity with aperture, the round presentations of electromagetic shielding of cavity are mentioned.

Keywords:  electromagnetic interference, electromagnetic coupling, shielding effectiveness,aperture, aperture arrays, metallic plate
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