单层金属网对低频探地雷达波屏蔽效能研究

摘要

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 depthhas 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 widthresulted in better shielding effectiveness; and larger wire diameter resulted in better shielding effectiveness.%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.