编织电缆屏蔽中的孔电感

H. Schippers, J. Verpoorte
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引用次数: 8

摘要

电缆金属编织带的屏蔽效果受其几何形状和材料的影响。屏蔽效果可以用金属编织带的传递阻抗来表征。传递阻抗的解析模型一般包含两部分,一部分表示电磁能量通过金属编织带的扩散,另一部分表示磁场通过编织带的泄漏。第二部分是局部现象,又分为三部分:孔电感、编织电感和表皮电感。孔电感是由磁场穿过编织孔的穿透来控制的。众所周知的分析模型将空穴电感的贡献高估了2倍。这可以很容易地通过将空穴电感项乘以一个因子(2/π)3/2来修正。
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Hole inductance in braided cable shields
The shielding effectiveness of metal braids of cables is governed by the geometry and the materials of the braid. The shielding effectiveness can be characterised by the transfer impedance of the metal braid. Analytical models for the transfer impedance contain in general two components, one representing diffusion of electromagnetic energy through the metal braid, and a second part representing leakage of magnetic fields through the braid. The second part is a local phenomenon, which again has three parts: hole inductance, braid inductance and skin inductance. The hole inductance is governed by the penetration of magnetic fields through the apertures of the braid. Well-known analytical models overestimate the contribution of the hole inductance by a factor two. This can be easily corrected by multiplying the hole inductance terms by a factor (2/π)3/2.
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