Method for calculating cable interference in infinite shielding layer with holes in point source radiation field

Abstract

The invention discloses a method for calculating cable interference in an infinite shielding layer with holes in a point source radiation field, is applied to the field of electromagnetic interference, and has the advantages of simple algorithm, accurate result, high efficiency and the like. In that method, the aisle of the voltage wave on the cable and the propagation aisle of the space electromagnetic field are represented by signal pipelines, the position with the energy reflection is represented by nodes, a signal flow graph reflecting the electromagnetic energy flow of the system is established, the propagation equation of the whole system signal pipeline and the scattering equation on all the nodes are established by using the magnetic flow element radiation instead of the small holetransmission, the extended BLT (Baum-Liu-Tesche) equation of the system electromagnetic interference is obtained, and the interference intensity on the cable is obtained by solving the extended BLT equation. The method realizes the accurate calculation of the electromagnetic interference of the point source radiation field in the infinite shielding layer with holes and is coupled to the transmission line, and the method effectively reduces the dependence on the computing resources and improves the efficiency.

Description

technical field [0001] The invention belongs to the field of electromagnetic interference, in particular to a method for calculating the interference of a point source radiation field to a cable on the other side of an infinitely large shielding layer with a hole. Background technique [0002] With the increasing electrification of industry and the development of wireless communication technology, the complexity of the electromagnetic environment has increased exponentially. External electromagnetic waves can be coupled to cables inside the device through small holes in the case of the electronic device, causing electromagnetic interference (EMI) to sensitive circuits. Interference intensity can be measured by the voltage amplitude induced on the cable, which is affected by the characteristics of the interference source, hole size, cable structure and their relative position. According to the electromagnetic field theory, the complex interference source can be regarded as t...

AI Technical Summary

Problems solved by technology

This method is of great significance in the field of electromagnetic interference calculation, but there are still some shortcomings

[0005] ① This method is a numerical method, which consumes a lot of time and computing resources;

[0006] ② This method deals with the field line coupling problem with the help of multi-conductor transmission line theory, which requires the combined use of FDTD, multi-conductor transmission line theory, etc., and the calculation is complicated and difficult to implement;

[0007] ③This method requires a series of pre-processing work such as modeling, meshing, and boundary imposition, which is relatively troublesome to implement

[0009] ① This method does not consider the small hole coupling of the electromagnetic field, and cannot be used for the coupling analysis of the actual electronic equipment chassis and the calculation of the electromagnetic interference intensity;

[0010] ②The focus of this method is to give the method of establishing the system extended BLT equation, and does not give the specific calculation method of the scattering parameters of the infinitely large shielding layer with holes;

[0011] ③This method is suitable for open-domain electromagnetic field coupling problems, but not for closed-domain electromagnetic field coupling problems

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