电磁波屏蔽散热合金无序网的分析与研究
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摘要
论文研究的是电磁波屏蔽散热合金无序网,该无序网由材料涂覆于网状的镍铜金属窝孔板材的骨架上而构成,其上窝孔孔壁有镍层和铜层共2～3层。
论文研究了电磁波屏蔽散热合金无序网的国内外研究现状,基于其具体的实际尺寸,利用HFSS仿真软件创建模型,设置模型的激励源、边界条件、求解类型,最终得到仿真的结果,并对仿真结果进行分析。
通过仿真结果和屏蔽材料的屏蔽效能的计算值的对比,证明了电磁波屏蔽散热合金无序网能够有效地屏蔽电磁波。分析了电磁波屏蔽散热合金无序网的铜镍镀覆结构在屏蔽电磁波方面的优点。分析了影响屏蔽效能的因素,包括电磁波屏蔽散热合金无序网膜层的厚度、开孔的形状和大小,得到了在不同频率条件下电磁波屏蔽散热合金无序网的电流分布和周围的场分布。电磁波屏蔽散热合金无序网的铜镍镀覆的特点和结构的特殊性还保证了它防尘,防酸,防碱等各项功能。最后讨论了当用电磁波屏蔽散热合金无序网作为仪器的外壳时的电磁兼容技术。
Plastic composite shielding materials, mostly good performance by the conductive metal material made of resin composite. The species also has a very wide range, while the surface coating shielding material is one of the categories. Through the molten metal spray, paste, foil and plastics electroplating and other methods, such plastic surface of the metal conductive layer is formed. Metal layer is mainly to the majority of electromagnetic wave reflection, absorption and internal reflection through which the electromagnetic wave to achieve the purpose of anti-electromagnetic interference.
Electroplating method by Cu, Ni plating to the ABS plastic, and its structure is sponge-like foam board, the pore wall of Ni - Cu - Ni layer composition, surface density is 350 to 480. Method, which is sponge-like foam or ABS as the substrate by magnetron sputtering method, so that nickel substrate obtained the first layer of Ni film, and then use the second layer of copper plating method plating layer and the third layer Ni layer, after annealing to remove the internal stress, while burning sponge foam substrate, the alloy disorder Network window nest hole shape, direction, size is disorderly, Guar has a good absorption of electromagnetic shielding performance ; as copper layer sandwiched between Ni film and Ni chemical is stable, so also has the dust, anti-acid, anti-alkali and other functions. High-strength ABS plastic and many other advantages, combined coating and substrate can be very strong, has good electromagnetic shielding effect. And conductive fiber filled ABS resin has good electrical conductivity on the one hand, can effectively shield electromagnetic waves, while maintaining the ABS resin, light weight, easy processing, low price, corrosion performance, size stability features.
Preparation of sponge-like foam nickel in copper metal alloy frame, in accordance with the background technology, can now thickness of 1.8mm +0.2 mm or 1.8mm-0.2mm of foam substrates by magnetron sputtering method or methods or conductive adhesive plating the first layer of nickel film was obtained, which have many smaller nest holes (pores) of the sheet of nickel stencil, then use the traditional process of electroplating the second layer of copper plating layer method, get the second floor of the nickel-copper metal alloys Net Framework; also the second layer of copper plating layer in a short time after the third layer of nickel plating layer by layer of nickel-copper alloy mesh skeleton. Preparation of sponge-like foam nickel copper alloy mesh framework, it can not heat to remove the stress and burn foam substrate.
The disorder is characterized by full use of network cavernous formation of copper alloy nickel foam "nest hole," the "disorder" and "infinite number" of the two features, combined with electromagnetic wave propagation and reflection characteristics of a straight line path design to gain an excellent screening absorption. Said shielding process: hinder, resist external electromagnetic leakage and interference during the process, no electromagnetic wave energy conversion; said absorption process: the part of the electromagnetic energy into heat energy. Shield absorption effect, because the sponge-like foam nickel copper alloy formed "nest hole" size, number, arrangement, nest hole wall geometry of S is infinite disorder and, in particular, each wall of the small of their normal S direction is random and infinite, electromagnetic waves in the reflection will also be disorderly and unlimited number, and a real sense of "arbitrary reflection." Each time the reflection of electromagnetic wave propagation hinder one, while electromagnetic (wave) can be converted into heat the first two, namely, absorption time, this macro will be an excellent shielding and absorption.
As the alloy is disordered network structure of the model for the rectangular, so when we take into account its analysis of the electromagnetic wave in the network through the alloy after the other side would be great if electromagnetic interference, and when to use the network as a disorder When shielding materials, packaging equipment within the structure of more complex, if excessive interference, then that may affect the normal operation of its internal components, only the electromagnetic shielding enough to reach as far as possible within the reach of electromagnetic interference minimum also is a problem we must consider, so analysis of the internal electromagnetic leakage can better guarantee the stability of the internal device. For the analysis of magnetic drain we need to consider the finite element formulation Pan.
Network for the alloy disorder and structural characteristics of materials, modeling and simulation in the frequency range from (0-2) GHz, this disorder full advantage of network irregularities, many of reflection and refraction to achieve a good the electromagnetic wave shielding effect. And because the copper layer of nickel on both sides of the folder, so also have good anti-acids, anti-alkali and other functions.
论文研究了电磁波屏蔽散热合金无序网的国内外研究现状,基于其具体的实际尺寸,利用HFSS仿真软件创建模型,设置模型的激励源、边界条件、求解类型,最终得到仿真的结果,并对仿真结果进行分析。
通过仿真结果和屏蔽材料的屏蔽效能的计算值的对比,证明了电磁波屏蔽散热合金无序网能够有效地屏蔽电磁波。分析了电磁波屏蔽散热合金无序网的铜镍镀覆结构在屏蔽电磁波方面的优点。分析了影响屏蔽效能的因素,包括电磁波屏蔽散热合金无序网膜层的厚度、开孔的形状和大小,得到了在不同频率条件下电磁波屏蔽散热合金无序网的电流分布和周围的场分布。电磁波屏蔽散热合金无序网的铜镍镀覆的特点和结构的特殊性还保证了它防尘,防酸,防碱等各项功能。最后讨论了当用电磁波屏蔽散热合金无序网作为仪器的外壳时的电磁兼容技术。
Plastic composite shielding materials, mostly good performance by the conductive metal material made of resin composite. The species also has a very wide range, while the surface coating shielding material is one of the categories. Through the molten metal spray, paste, foil and plastics electroplating and other methods, such plastic surface of the metal conductive layer is formed. Metal layer is mainly to the majority of electromagnetic wave reflection, absorption and internal reflection through which the electromagnetic wave to achieve the purpose of anti-electromagnetic interference.
Electroplating method by Cu, Ni plating to the ABS plastic, and its structure is sponge-like foam board, the pore wall of Ni - Cu - Ni layer composition, surface density is 350 to 480. Method, which is sponge-like foam or ABS as the substrate by magnetron sputtering method, so that nickel substrate obtained the first layer of Ni film, and then use the second layer of copper plating method plating layer and the third layer Ni layer, after annealing to remove the internal stress, while burning sponge foam substrate, the alloy disorder Network window nest hole shape, direction, size is disorderly, Guar has a good absorption of electromagnetic shielding performance ; as copper layer sandwiched between Ni film and Ni chemical is stable, so also has the dust, anti-acid, anti-alkali and other functions. High-strength ABS plastic and many other advantages, combined coating and substrate can be very strong, has good electromagnetic shielding effect. And conductive fiber filled ABS resin has good electrical conductivity on the one hand, can effectively shield electromagnetic waves, while maintaining the ABS resin, light weight, easy processing, low price, corrosion performance, size stability features.
Preparation of sponge-like foam nickel in copper metal alloy frame, in accordance with the background technology, can now thickness of 1.8mm +0.2 mm or 1.8mm-0.2mm of foam substrates by magnetron sputtering method or methods or conductive adhesive plating the first layer of nickel film was obtained, which have many smaller nest holes (pores) of the sheet of nickel stencil, then use the traditional process of electroplating the second layer of copper plating layer method, get the second floor of the nickel-copper metal alloys Net Framework; also the second layer of copper plating layer in a short time after the third layer of nickel plating layer by layer of nickel-copper alloy mesh skeleton. Preparation of sponge-like foam nickel copper alloy mesh framework, it can not heat to remove the stress and burn foam substrate.
The disorder is characterized by full use of network cavernous formation of copper alloy nickel foam "nest hole," the "disorder" and "infinite number" of the two features, combined with electromagnetic wave propagation and reflection characteristics of a straight line path design to gain an excellent screening absorption. Said shielding process: hinder, resist external electromagnetic leakage and interference during the process, no electromagnetic wave energy conversion; said absorption process: the part of the electromagnetic energy into heat energy. Shield absorption effect, because the sponge-like foam nickel copper alloy formed "nest hole" size, number, arrangement, nest hole wall geometry of S is infinite disorder and, in particular, each wall of the small of their normal S direction is random and infinite, electromagnetic waves in the reflection will also be disorderly and unlimited number, and a real sense of "arbitrary reflection." Each time the reflection of electromagnetic wave propagation hinder one, while electromagnetic (wave) can be converted into heat the first two, namely, absorption time, this macro will be an excellent shielding and absorption.
As the alloy is disordered network structure of the model for the rectangular, so when we take into account its analysis of the electromagnetic wave in the network through the alloy after the other side would be great if electromagnetic interference, and when to use the network as a disorder When shielding materials, packaging equipment within the structure of more complex, if excessive interference, then that may affect the normal operation of its internal components, only the electromagnetic shielding enough to reach as far as possible within the reach of electromagnetic interference minimum also is a problem we must consider, so analysis of the internal electromagnetic leakage can better guarantee the stability of the internal device. For the analysis of magnetic drain we need to consider the finite element formulation Pan.
Network for the alloy disorder and structural characteristics of materials, modeling and simulation in the frequency range from (0-2) GHz, this disorder full advantage of network irregularities, many of reflection and refraction to achieve a good the electromagnetic wave shielding effect. And because the copper layer of nickel on both sides of the folder, so also have good anti-acids, anti-alkali and other functions.
引文
[1]Kildishev A V, Volokhov SA, DobrodejevPN. The transformation of spatial harmonics in a combined electromagnetic shield [J] . 2004 ,7:72 - 74.
[2]Baolin Liu, Beixing Deng;,Hui Fan, Xinshan Ma . A new method solving problems of electromagnetic shielding for a thin cylindrical shell of arbitrary cross section [J]. 2002,5:730–734 .
[3]Ming-Shing Lin . Analysis of measurement uncertainty in the measurement of electromagnetic shielding [J].Microwave Conference, 2001,1(2):906-909.
[4]Liu Baolin,Shen Peihua,Ma Xinshan.A new method obtaining integral equations in problems of electromagnetic shielding for a thin cylindrical shell of arbitrary cross section:US,825061 [P].1999-10-11.
[5]Deng Yun,Zeng Yuan,Xu Jiadong. Research of transparent films for electromagnetic shielding[C].DigitalObject identifier ,2005.
[6]Ward S.M,Marvin A.C,Dawson Towards. An improved definition and measurement of electromagnetic shielding effectiveness[J].J.F , 2000,1,27:55-60.
[7]Tzong-Lin Wu , Cheng-Wei Lin , Wen-Chi Hung , Chien-Hui Lee ,Wern-Shiarng Jou,Wood-Hi Cheng.High electromagnetic shielding of plastic package for 2.5-Gb/s optical transceiver modules[C].Digital Object Identifier ,2004.
[8]Yamane T,Nishikata A,Shimizu Y.Resonance suppression of a spherical electromagnetic shielding enclosure by using conductive dielectrics[C].Digital Object Identifier ,2003.
[9]BadicM,Marinescu M.-J.A method to display and measure reflectionand absorption loss in electromagnetic shields[C]. 2003.
[10]Ding J,Linton D,Armstrong M,Mitchell N,Fusco V.Multiphysics Simulation of Electromagnetic Shielding and Thermal Stressing within Ceramic and Silicon Multilayer Packages for RF Applications[C].Digital Object Identifier,2006.
[11]IEEE Trans .Special Issue in shielding[C].EMC March 1986 and Aug.1988.
[12]P.F.Wilson and M.T.Ma.A Study of Techniques for Measuring the Electromagnetic shielding effectiveness of material[R].No.1095,July 1986.
[13]M.S.Lin,C.H.Chen. Evaluation of plane-wave shielding properties of anisotropic laminated composites using[C]. GTEM , IEEE international Symp. on EMC,pp.548-550 Atlanta,1995.
[14]R.F.Wilson,M.T.ma. Shielding effectiveness measurements with dual TEM cell, IEEE Trans[C]. On EMC,Vol.27,pp.137-142,Aug.1985.
[15]ASTM D.Standard Test Method for Measuring the Electromagnetic Shielding Effectiveness of Planar Materials[C].1999.
[16]C.Zombolas. Mutual recognition agreements-problems caused by inconsistencies in the accreditation requirements of EMC test laboratory[J]. IEEE international Symp .on EMC,2000 ,8:257-261.
[17]A. Nishikata,S.Kiener. Shielding effectiveness an intersect parameter of shields? [J]. In Proc.int.Symp.Electromagn.Compat. 1994:723-726.
[18]McGraw-Hill,J.A.Stratton. Electromagnetic Theory[J]. NEW York, 1941:564.
[19]F.Olyslager, E.Laermans, D.De Zutter,S.Criel,R.De Smedt, N.Lietaert, and A.De Clercq. Numerical and experimental study of the shielding effectiveness of a metallicenclosure[J].IEEE Trans Electromagn . Compact, Aug. 1999:202-213.
[20]高攸纲.电磁环境对人体健康的危害效应和剂量学中存在的若干问题[J],安全与电磁兼容,2004,6.
[21]黄学光.时域有限差分法及其在电磁兼容中的应用[D].西安:西安电子科技大学博士论文,2000.
[22]葛德彪,闫玉波.电磁波时域有限差分方法[M].西安:西安电子科技大学出版社,2002.
[23]王长清,祝西里.电磁场计算中的时域有限差分法[M].北京:北京大学出版社,1994.
[24]高本庆.时域有限差分法[M].北京:国防工业出版社,1995.
[25]郭剑.基于Vector Fitting的金属薄壳电磁脉冲屏蔽效能的计算[M].北京:清华大学出版社,2004.
[26]刘川.利用屏蔽室壁面的标准测试口测量孔缝泄漏及材料的屏蔽效能[J].安全与电磁兼容,2002.
[27]马双武,高攸刚.有孔金属导体板的FDTD建模与计算[J],2002.
[28]马双武,高攸刚.“有孔金属平板屏蔽特性的研究”全国电磁兼容学术会议论文集EMC[J],2000.
[29]朱湘琴,葛德彪.单层和多层有缝金属板电磁波透射的FDTD分析[J].电波科学学报,2004,6.
[30]Taflove A. Computational Electrodynamics: The Finite Difference Time Domain Method (Second Edition).Norwood, MA[R] .Artech House, 2000.
[31]张丽芳,佟富强,任宝林. ABS_Cu_Ni电磁屏蔽复合材料的研制[J].材料导报,1994.
[32]张丽芳,李文明,任宝林.ABS塑料Cu_Ni双镀层的电磁屏蔽性能[J].吉林大学自然科学学报,1995,3.
[2]Baolin Liu, Beixing Deng;,Hui Fan, Xinshan Ma . A new method solving problems of electromagnetic shielding for a thin cylindrical shell of arbitrary cross section [J]. 2002,5:730–734 .
[3]Ming-Shing Lin . Analysis of measurement uncertainty in the measurement of electromagnetic shielding [J].Microwave Conference, 2001,1(2):906-909.
[4]Liu Baolin,Shen Peihua,Ma Xinshan.A new method obtaining integral equations in problems of electromagnetic shielding for a thin cylindrical shell of arbitrary cross section:US,825061 [P].1999-10-11.
[5]Deng Yun,Zeng Yuan,Xu Jiadong. Research of transparent films for electromagnetic shielding[C].DigitalObject identifier ,2005.
[6]Ward S.M,Marvin A.C,Dawson Towards. An improved definition and measurement of electromagnetic shielding effectiveness[J].J.F , 2000,1,27:55-60.
[7]Tzong-Lin Wu , Cheng-Wei Lin , Wen-Chi Hung , Chien-Hui Lee ,Wern-Shiarng Jou,Wood-Hi Cheng.High electromagnetic shielding of plastic package for 2.5-Gb/s optical transceiver modules[C].Digital Object Identifier ,2004.
[8]Yamane T,Nishikata A,Shimizu Y.Resonance suppression of a spherical electromagnetic shielding enclosure by using conductive dielectrics[C].Digital Object Identifier ,2003.
[9]BadicM,Marinescu M.-J.A method to display and measure reflectionand absorption loss in electromagnetic shields[C]. 2003.
[10]Ding J,Linton D,Armstrong M,Mitchell N,Fusco V.Multiphysics Simulation of Electromagnetic Shielding and Thermal Stressing within Ceramic and Silicon Multilayer Packages for RF Applications[C].Digital Object Identifier,2006.
[11]IEEE Trans .Special Issue in shielding[C].EMC March 1986 and Aug.1988.
[12]P.F.Wilson and M.T.Ma.A Study of Techniques for Measuring the Electromagnetic shielding effectiveness of material[R].No.1095,July 1986.
[13]M.S.Lin,C.H.Chen. Evaluation of plane-wave shielding properties of anisotropic laminated composites using[C]. GTEM , IEEE international Symp. on EMC,pp.548-550 Atlanta,1995.
[14]R.F.Wilson,M.T.ma. Shielding effectiveness measurements with dual TEM cell, IEEE Trans[C]. On EMC,Vol.27,pp.137-142,Aug.1985.
[15]ASTM D.Standard Test Method for Measuring the Electromagnetic Shielding Effectiveness of Planar Materials[C].1999.
[16]C.Zombolas. Mutual recognition agreements-problems caused by inconsistencies in the accreditation requirements of EMC test laboratory[J]. IEEE international Symp .on EMC,2000 ,8:257-261.
[17]A. Nishikata,S.Kiener. Shielding effectiveness an intersect parameter of shields? [J]. In Proc.int.Symp.Electromagn.Compat. 1994:723-726.
[18]McGraw-Hill,J.A.Stratton. Electromagnetic Theory[J]. NEW York, 1941:564.
[19]F.Olyslager, E.Laermans, D.De Zutter,S.Criel,R.De Smedt, N.Lietaert, and A.De Clercq. Numerical and experimental study of the shielding effectiveness of a metallicenclosure[J].IEEE Trans Electromagn . Compact, Aug. 1999:202-213.
[20]高攸纲.电磁环境对人体健康的危害效应和剂量学中存在的若干问题[J],安全与电磁兼容,2004,6.
[21]黄学光.时域有限差分法及其在电磁兼容中的应用[D].西安:西安电子科技大学博士论文,2000.
[22]葛德彪,闫玉波.电磁波时域有限差分方法[M].西安:西安电子科技大学出版社,2002.
[23]王长清,祝西里.电磁场计算中的时域有限差分法[M].北京:北京大学出版社,1994.
[24]高本庆.时域有限差分法[M].北京:国防工业出版社,1995.
[25]郭剑.基于Vector Fitting的金属薄壳电磁脉冲屏蔽效能的计算[M].北京:清华大学出版社,2004.
[26]刘川.利用屏蔽室壁面的标准测试口测量孔缝泄漏及材料的屏蔽效能[J].安全与电磁兼容,2002.
[27]马双武,高攸刚.有孔金属导体板的FDTD建模与计算[J],2002.
[28]马双武,高攸刚.“有孔金属平板屏蔽特性的研究”全国电磁兼容学术会议论文集EMC[J],2000.
[29]朱湘琴,葛德彪.单层和多层有缝金属板电磁波透射的FDTD分析[J].电波科学学报,2004,6.
[30]Taflove A. Computational Electrodynamics: The Finite Difference Time Domain Method (Second Edition).Norwood, MA[R] .Artech House, 2000.
[31]张丽芳,佟富强,任宝林. ABS_Cu_Ni电磁屏蔽复合材料的研制[J].材料导报,1994.
[32]张丽芳,李文明,任宝林.ABS塑料Cu_Ni双镀层的电磁屏蔽性能[J].吉林大学自然科学学报,1995,3.