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在通信电缆中广泛地采用双层结构的电磁屏蔽。这种屏蔽在谐波状态下的屏蔽系数由下式算出:式中K_1、K_2——系数;k_1、k_2——波数;θ_1、θ_2——分别为第一层及第二层屏蔽的厚度;ν_a——屏蔽的平均半径(θ_1+θ_2〈〈γ_a)。为了确定单位阶跃形式脉冲作用于双层屏蔽时通过双层屏蔽的脉冲电磁场,必须计算出积分: h_(12)(t)=(1/2π)integral from n=-∞ to ∞(dx/x)F(ω)S_(12)(ω)e~(jωi)dω (2)式中F(ω)——单位阶跃谱;ω——角频率。利用留数法来解算式(2)。参考文献[2]指出,包
In communications cables widely used double-layer structure of electromagnetic shielding. The shielding coefficient of the shield in the harmonic state is calculated by the following formula: where K_1 and K_2 are the coefficients; k_1 and k_2 are the wavenumbers; θ_1 and θ_2 are the thicknesses of the first layer and the second layer, respectively; ν_a - the average radius of the shield (θ_1 + θ_2 << γ_a). In order to determine the impulse electromagnetic field that passes through the double-layer shield when a unit step-type pulse is applied to the double shield, an integral must be calculated: h ¼ (12) (1 / 2π) integral from n ¼ ∞ to ∞ (dx / (12) (ω) e ~ (jωi) dω (2) where F (ω) - unit step spectrum; ω - angular frequency. Residual method to solve the equation (2). Reference [2] pointed out that the package