Region-division analytical model for calculating internal field distribution of bored rectangular shielding body

Abstract

The invention, which belongs to the technical field of electromagnetic shielding, discloses a region-division analytical model for calculating internal field distribution of a bored rectangular shielding body. A region inside a bored rectangular shielding body is divided into a small hole region, a dipole region and a waveguide region; and nalytical models are established in different regions, wherein the analytical models are as follows: a bored infinitely-great metal plate equivalent way used by the small hole region, a dipole radiation model approximating way is employed by the dipole region, and a waveguide mode is employed by the waveguide region for equivalence. On the basis of the analytical models, the internal field distribution of the bored rectangular shielding body is calculated and thus an electromagnetic shielding efficiency is obtained; and on the basis of comparison with a full-wave simulation result, correctness of the analytical models is verified. According to the invention, the physical meaning becomes clear; the calculation speed is fast; and the efficiency is high. Moreover, a field distribution rule of all sub regions inside the bored cavity can be described accurately; and the region-division analytical model has the guidance significance in studying internal field distribution of the bored shielding body.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic shielding, in particular to a partition analysis model for calculating the internal field distribution of a rectangular shielding body with openings. Background technique [0002] Electromagnetic shielding is one of the main technical measures to suppress electromagnetic interference. It has a wide range of applications. A common method is to apply a metal cavity to the outer shell of the equipment to isolate the source of disturbance and sensitive equipment to achieve the purpose of electromagnetic shielding. A completely enclosed metal cavity has good electromagnetic shielding effectiveness, but in practical applications, due to considerations of heat dissipation, ventilation, etc., and technical limitations, there are inevitably openings and gaps in the cavity, which makes the shielding effectiveness Therefore, the electromagnetic field shielding effectiveness of the open cavity is a re...

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Problems solved by technology

At present, the calculation methods of the shielding effectiveness of perforated shields mainly include analytical theory and numerical calculation. The analytical theory has been proposed, such as Bethe's small hole coupling theory and the equivalent circuit method, but these methods are only calculated in a certain part of the cavity. The result is more accurate and not suitable for the calculation of electromagnetic shielding effectiveness inside the entire cavity

Although the numerical method has a wide range of applications, high calculation accuracy, and accurate results, the calculation speed is slow and takes a long time, and professional software is required. Therefore, it is of practical significance to develop an analytical model with high calculation efficiency, accurate results, and clear physical meaning.

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