电子产品机械结构电磁谐振特性及计算和抑制方法研究
发布时间：2018-09-14 11:51
【摘要】：随着电子信息以及无线通信技术的快速发展,电子产品得到了广泛的应用且日趋向高密度、高频率、高集成度方向发展,使其极易受到电磁干扰。电磁屏蔽虽能够在宽频带内保证电子产品具有较高的屏蔽效能,但是一旦出现电磁谐振,谐振点处屏蔽效能就会急剧下降,造成严重的电磁泄露。因此,电磁谐振已经成为影响电子产品工作性能的最重要的原因之一。本文以电子产品机械结构为研究对象,对其电磁谐振特性及其抑制方法进行了系统的研究,主要包括以下几方面的内容:1)基于电磁波传输和散射原理,结合波导理论及谐振腔理论,分析三种不同谐振产生的原因、原理和基本规律,得到了相应的谐振机理以及谐振发生条件,从而可以在理论上对电子产品的电磁谐振现象进行系统的分析。2)对两种广泛应用的电磁谐振分析和计算方法等效电路法和广义网络方法进行了扩展。等效电路法方面,结合孔阵等效建模方法,改善了孔阵特性阻抗,提高了计算精度,并解决了等效电路法应用时监测点太靠近开孔腔壁会导致误差偏大的问题。广义网络法方面,利用提出的创新性的模型通过广义网络法对三种谐振进行了综合和系统的研究,得到了谐振发生条件以及谐振机理,在此基础上结合波导理论推导出了谐振频率公式。3)通过三维电磁场仿真软件CST进行建模仿真,得到了腔体、缝隙以及孔阵各结构参数对电子产品电磁谐振特性的影响规律,对电子产品机械结构设计具有一定的指导意义。并在此基础上实现了对IBM3550服务器机箱的结构优化,改善了其谐振特性。4)简要介绍了电磁损耗材料的相关电磁参数,然后结合电磁场传输以及微扰理论系统分析了其对电磁能量损耗以及谐振频率的影响规律;通过建模仿真,得到了磁损耗材料的结构参数以及电磁参数的电磁谐振特性,然后通过在IBM3550服务器机箱内壁贴装磁损耗材料进一步改善了其电磁谐振特性,达到了更好地抑制电磁谐振的目的。
[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.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN03
，
本文编号：2242631
[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.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN03
，
本文编号：2242631
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