Method and device for calculating shielding effectiveness of electromagnetic shielding net and a storage medium

Abstract

The invention discloses a method and device for calculating the shielding effectiveness of an electromagnetic shielding net and a storage medium, and the method comprises the steps: obtaining a distribution model diagram of the electromagnetic shielding net with periodic distribution characteristics and uniform plane electromagnetic waves, and obtaining subunits of the electromagnetic shielding net; establishing a geometric model containing continuous periodic boundary conditions according to the subunits; dividing the geometric model into an electromagnetic shielding net space, an external space and a shielded space; placing the subunits in an electromagnetic shielding net space, placing the uniform planar electromagnetic waves in an external space, and presetting an observation point ina shielded space; setting simulation model parameters according to the geometric model and the electromagnetic shielding net to obtain a simulation model; performing numerical calculation on the simulation model to obtain the electric field intensity at the observation point; and obtaining the shielding effectiveness of the electromagnetic shielding net according to a shielding effectiveness calculation formula. The shielding effectiveness of the electromagnetic shielding net with the periodic distribution characteristic and any shape can be calculated, and the calculation result is more accurate.

Description

technical field [0001] The invention relates to the technical field of shielding effectiveness testing, in particular to a calculation method, device and storage medium for the shielding effectiveness of an electromagnetic shielding net. Background technique [0002] Electromagnetic shielding effectiveness is one of the important performances of the equipment system, especially in a complex electromagnetic environment, a good shielding effect can suppress the adverse effects of strong electromagnetic interference on the equipment system. The shielding effectiveness of the metal mesh has a very important impact on the performance of the entire shielded room. Therefore, in the design of the shielding room, it is necessary to determine the shielding effectiveness of the metal mesh through calculation, and to design the structure of the shielding mesh. [0003] At present, the engineering calculation method for the shielding effectiveness of metal mesh is mainly the approximate...

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Problems solved by technology

[0003] At present, the engineering calculation method for the shielding effectiveness of metal mesh is mainly the approximate analytical method, and the approximate analytical method will cause certain calculation errors because it ignores some geometric features of the metal mesh, especially for waveguides with complex geometric cross-sections, it is difficult to obtain their attenuation characteristics, characteristic impedance and other characteristic parameters, causing calculation difficulties

Although the existing technology can also use the numerical calculation method for calculation, it is only applicable to the field quantity in the space in the case of finite direction and infinite direction. When calculating the case of infinite direction and infinite direction, the shielding body must be artificially included in the waveguide, resulting in There are large theoretical errors in the calculation results

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