Electromagnetic shielding devices are secondary development on the basis of electromagnetic shielding materials. The required materials must have good electrical conductivity. According to the preparation process of materials, electromagnetic shielding materials mainly include three categories: 1) Metals: direct selection Metal materials, such as beryllium copper, stainless steel, etc.; 2) Filling type: Add a certain proportion of conductive fillers to the non-conductive substrate to make the material conductive. The substrate can be made of silica gel, plastic and other materials, and the conductive filler can be Materials such as metal powder, metal fiber or metallized fiber; 3) Surface coating and conductive coatings: electroplating the substrate, such as conductive cloth, etc. From the device point of view, currently widely used electromagnetic shielding devices mainly include conductive plastic devices, conductive silica gel, metal shielding devices, conductive cloth gaskets, and wave absorbing devices.
The technical level of electromagnetic shielding devices is mainly dominated by the development of its materials. The electrical conductivity, magnetic permeability and material thickness of the materials are the three basic factors of the shielding effectiveness. Electromagnetic shielding materials will develop in the direction of higher shielding efficiency, wider shielding frequency and better comprehensive performance, and the innovative application of various new materials in electromagnetic shielding will be more developed. In the future technological development, electromagnetic shielding will be developed in terms of good electrical conductivity, simple processing technology, high cost performance, and suitable for mass production. In the future, more and more types of electronic devices will be included in the standards of electromagnetic compatibility management, and the standards of electromagnetic compatibility will become more and more strict. It is foreseeable that the continuous upgrading trend of electromagnetic device process materials will be a deterministic direction.
The technical level of electromagnetic shielding devices is mainly dominated by the development of its materials. The electrical conductivity, magnetic permeability and material thickness of the materials are the three basic factors of the shielding effectiveness. Electromagnetic shielding materials will develop in the direction of higher shielding efficiency, wider shielding frequency and better comprehensive performance, and the innovative application of various new materials in electromagnetic shielding will be more developed. In the future technological development, electromagnetic shielding will be developed in terms of good electrical conductivity, simple processing technology, high cost performance, and suitable for mass production. In the future, more and more types of electronic devices will be included in the standards of electromagnetic compatibility management, and the standards of electromagnetic compatibility will become more and more strict. It is foreseeable that the continuous upgrading trend of electromagnetic device process materials will be a deterministic direction.