[EMC]Coupling Model and Impedance Calculation of the Steel Ground Loops With Proximity Effect

Abstract—This paper focuses on the coupling model and the "i0{E!,XL  
coupling impedances between two circuits with a common ground gg $/  
of a steel plane. By adopting a two-dimensional (2-D) electromagnetic @'>h P  
model, the influence of the skin and the proximity effects (Qq;ySZ#  
are considered. In the case of a strong proximity effect due to the vncLB&@7  
exterior wires, the distribution of the electromagnetic field inside cc`+rD5I-  
and outside a steel plane is analyzed, and an equivalent coupling qp$Td<'Y  
circuitmodel of two circuits with a common steel plane is built. The }TE4)vXs  
analytical solution of the coupling impedances and its frequency {ZQ|Ydpk  
characteristics are calculated based on the proposed model. The solution &v9*D`7L  
is validated by the numerical solutions and the measurement 'qel3Fs"  
results in the frequency range of 40 Hz–15 M Hz. The influence WX<),u2@  
of the proximity due to nearby wires is severe in high-frequency n=Qz7N(M  
situations, and the intern .. _]zm02|  
UP]X,H~stU  

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