单层金属网对低频探地雷达波屏蔽效能研究
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摘要
本文研究了低频探地雷达天线发射的5~30MHz电磁波以金属网为屏蔽材料进行远区屏蔽的效能,影响因子为金属网趋肤深度δ,被屏蔽电磁波频率f,孔宽W和丝网直径t。通过对紫铜网、铝丝网、铁丝网和不锈钢丝网的电磁屏蔽效能的理论测算得出:总体上,金属网的屏蔽效能随着电磁波频率的升高而降低;金属网趋肤深度δ对总体屏蔽效能的影响不大;孔宽W对铁丝网屏蔽效能的影响呈现先降低后增高的趋势,而对于小网孔(W≤4.8cm)的铁丝网,孔宽W越小屏蔽效果越好;铁丝网丝径t越大,屏蔽效果越好。
We studied the remote area shielding effectiveness of metal mesh on the electromagnetic waves launched by low-frequency ground penetrating radar(GPR) antenna. Through the theoretical calculations of shielding effectiveness of copper mesh, aluminum mesh, iron wire mesh, and stainless steel wire mesh, we concluded the following results: the shielding effectiveness decreased with the increase of the electromagnetic wave frequency; Metal mesh skin depth has little effect on the overall shielding effectiveness; the effect of hole width on shielding effectiveness firstly increased and then reduced; as for the small mesh size(W≤4.8cm), smaller hole width resulted in better shielding effectiveness; and larger wire diameter resulted in better shielding effectiveness.
We studied the remote area shielding effectiveness of metal mesh on the electromagnetic waves launched by low-frequency ground penetrating radar(GPR) antenna. Through the theoretical calculations of shielding effectiveness of copper mesh, aluminum mesh, iron wire mesh, and stainless steel wire mesh, we concluded the following results: the shielding effectiveness decreased with the increase of the electromagnetic wave frequency; Metal mesh skin depth has little effect on the overall shielding effectiveness; the effect of hole width on shielding effectiveness firstly increased and then reduced; as for the small mesh size(W≤4.8cm), smaller hole width resulted in better shielding effectiveness; and larger wire diameter resulted in better shielding effectiveness.
引文
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[16]段玉平,刘顺华,管洪涛,等.缝隙对金属网屏蔽效能的影响[J].安全与电磁兼容,2004(4):46-48
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[18]刘涤尘.金属网的屏蔽效能试验及分析研究[J].武汉水利电力大学学报,1996,29(4):69-74
[2]杨可,赵新生,赵钦.探地雷达方法的原理及工作方法技术简介[J].西部探矿工程,2011(6):151-152
[3]孙洪星,李凤明.探地雷达高频电磁波传播衰减机理与应用实例[J].岩石力学与工程学报,2002,21(2):413-417
[4]刘传孝.探地雷达空洞探测机理研究及应用实例[J].岩石力学与工程学报,2000,19(2):238-241
[5]郭铁拴,刘兰波,张晓东.地质雷达技术指标的标定研究[J].地球物理学进展,2005,20(2):454-459
[6]袁岩兴.低频磁屏蔽材料的制备与研究[D].北京:北京工业大学,2005
[7]高攸纲.屏蔽与接地[M].北京:北京邮电大学出版社,2004
[8]张劲松,赵育刚,王梦茹.低频地质雷达深层探测分析[J].地球物理学进展,2010,25(5):1848-1855
[9]程丽丽,江玲.黄铜和不锈钢丝电磁屏蔽效能的研究[J].电子质量,2006(9):72-74
[10]崔生,沈晓冬,袁林生,等.电磁屏蔽和吸波材料的研究进展[J].电子元件与材料,2005,24(1):57-61
[11]徐福平,冯晨,王以伦,等.应用科技[J].电子测量技术,2005,32(11):28-33
[12]赵灵智,胡社军,何琴玉,等.电磁屏蔽材料的屏蔽原理与研究现状[J].包装工程,2006,27(2):1-4
[13]万鹏.金属网电磁屏蔽问题初探[J].安全与电磁兼容,1999(3):27-29.
[14]J.A.Pomposo,J.Rodriguez,H.Grande.Polypyrrolebased conducting hot melt adhesives for EMI shielding applications[J].Synthetic Metals,1999,PII(104):107-111
[15]N.C.Das,D.Khastgir,T.K.Chaki,A.Chakraborty.Electromagnetic interference shielding effectiveness of carbon black and carbon fibre filled EVA and NR based composites.[J].Composites part A:Applied Science and Manufacturing,2000,31(10):1069-1081
[16]段玉平,刘顺华,管洪涛,等.缝隙对金属网屏蔽效能的影响[J].安全与电磁兼容,2004(4):46-48
[17]刘顺华,刘军民,董星龙,等.电磁波屏蔽及吸波材料[M].北京:化学工业出版社,2014
[18]刘涤尘.金属网的屏蔽效能试验及分析研究[J].武汉水利电力大学学报,1996,29(4):69-74