【摘要】：隨著電子信息以及無線通信技術的快速發展,電子產品得到了廣泛的應用且日趨向高密度、高頻率、高集成度方向發展,使其極易受到電磁干擾。電磁屏蔽雖能夠在寬頻帶內保證電子產品具有較高的屏蔽效能,但是一旦出現電磁諧振,諧振點處屏蔽效能就會急劇下降,造成嚴重的電磁泄露。因此,電磁諧振已經成為影響電子產品工作性能的最重要的原因之一。本文以電子產品機械結構為研究對象,對其電磁諧振特性及其抑制方法進行了系統的研究,主要包括以下幾方面的內容:1)基于電磁波傳輸和散射原理,結合波導理論及諧振腔理論,分析三種不同諧振產生的原因、原理和基本規律,得到了相應的諧振機理以及諧振發生條件,從而可以在理論上對電子產品的電磁諧振現象進行系統的分析。2)對兩種廣泛應用的電磁諧振分析和計算方法等效電路法和廣義網絡方法進行了擴展。等效電路法方面,結合孔陣等效建模方法,改善了孔陣特性阻抗,提高了計算精度,并解決了等效電路法應用時監測點太靠近開孔腔壁會導致誤差偏大的問題。廣義網絡法方面,利用提出的創新性的模型通過廣義網絡法對三種諧振進行了綜合和系統的研究,得到了諧振發生條件以及諧振機理,在此基礎上結合波導理論推導出了諧振頻率公式。3)通過三維電磁場仿真軟件CST進行建模仿真,得到了腔體、縫隙以及孔陣各結構參數對電子產品電磁諧振特性的影響規律,對電子產品機械結構設計具有一定的指導意義。并在此基礎上實現了對IBM3550服務器機箱的結構優化,改善了其諧振特性。4)簡要介紹了電磁損耗材料的相關電磁參數,然后結合電磁場傳輸以及微擾理論系統分析了其對電磁能量損耗以及諧振頻率的影響規律;通過建模仿真,得到了磁損耗材料的結構參數以及電磁參數的電磁諧振特性,然后通過在IBM3550服務器機箱內壁貼裝磁損耗材料進一步改善了其電磁諧振特性,達到了更好地抑制電磁諧振的目的。
[Abstract]:With the rapid development of electronic information and wireless communication technology, electronic products have been widely used and increasingly developed to the direction of high density, high frequency and high integration, which makes them vulnerable to electromagnetic interference. Electromagnetic shielding can guarantee the high shielding efficiency of electronic products in a wide frequency band, but once electromagnetic resonance occurs, the shielding effectiveness at the resonance point will decrease sharply, resulting in serious electromagnetic leakage. Therefore, electromagnetic resonance has become one of the most important factors affecting the performance of electronic products. In this paper, the mechanical structure of electronic products is taken as the object of study. The electromagnetic resonance characteristics and their suppression methods are systematically studied, including the following contents: 1) based on the principle of electromagnetic wave transmission and scattering. Combined with waveguide theory and resonator theory, the causes, principles and basic laws of three kinds of resonance are analyzed, and the corresponding resonant mechanism and resonant conditions are obtained. Thus, the electromagnetic resonance phenomena of electronic products can be analyzed in theory. 2) two widely used electromagnetic resonance analysis and calculation methods, equivalent circuit method and generalized network method, are extended. In the aspect of equivalent circuit method, combined with the equivalent modeling method of the aperture array, the characteristic impedance of the aperture array is improved, the calculation accuracy is improved, and the problem that the monitoring point is too close to the wall of the open cavity can be solved when the equivalent circuit method is applied. In the aspect of generalized network method, three kinds of resonance are synthetically and systematically studied by using the proposed innovative model, and the conditions and mechanism of resonance are obtained. On this basis, the resonant frequency formula .3 is derived based on waveguide theory. The influence of cavity, slot and aperture array structure parameters on the electromagnetic resonance characteristics of electronic products is obtained by modeling and simulation using three-dimensional electromagnetic field simulation software CST. It has certain guiding significance for mechanical structure design of electronic products. On this basis, the structure optimization of IBM3550 server crate is realized, and its resonance characteristic is improved. (4) the electromagnetic parameters of electromagnetic loss material are introduced briefly. Then the influence law of electromagnetic energy loss and resonance frequency is analyzed by combining electromagnetic field transmission and perturbation theory. Through modeling and simulation, the structure parameters of magnetic loss material and electromagnetic resonance characteristics of electromagnetic parameters are obtained. Then the electromagnetic resonance characteristics are further improved by installing magnetic loss material into the inner wall of the IBM3550 server case, and the purpose of restraining the electromagnetic resonance is achieved.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN03
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本文編號：2242631