Calculation Method of Interference of Point Source Radiation Field on Cables in Infinite Shielding Layer with Holes

Abstract

The invention discloses a method for calculating the interference of a point source radiation field on a cable in an infinitely large shielding layer with a hole. It is applied to the field of electromagnetic interference and has the advantages of simple algorithm, accurate results, and high efficiency. The invention uses the voltage on the cable The wave propagation channel and the space electromagnetic field propagation channel are represented by signal pipes, and the positions with energy reflection are represented by nodes, and the signal flow diagram reflecting the electromagnetic energy flow of the system is established, and the magnetic flow element radiation is used instead of the small hole transmission to establish the whole The propagation equation on the signal pipeline of the system and the scattering equation on all nodes are synthesized to obtain the extended BLT (Baum‑Liu‑Tesche) equation of the system electromagnetic interference, and the extended BLT equation is solved to obtain the interference intensity on the cable to achieve point-to-point The accurate calculation of the electromagnetic interference that the source radiation field couples to the transmission line through the infinite shielding layer with holes effectively reduces the dependence on 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

Images