Absorbing shielding materialIt is a material used to shield electromagnetic radiation, usually made of metal, non-metal, or a composite of metal and non-metal. Its main purpose is to prevent electromagnetic radiation from causing damage to the human body and the environment, while also reducing the interference of electromagnetic radiation on electronic devices and communication systems.
The main components of absorbing shielding materials are metal, non-metal, or a combination of metal and non-metal. Common absorbing and shielding materials include ferroalloys, polytetrafluoroethylene, polycarbonate, etc. Among them, ferroalloy is a commonly used shielding material with high conductivity and electromagnetic shielding performance. Polytetrafluoroethylene is a plastic with strong corrosion resistance and excellent physical properties, commonly used in the manufacture of mechanical parts and sealing materials. Polycarbonate is a high dielectric constant plastic with high electromagnetic shielding properties, commonly used in the manufacture of electronic devices and communication systems.
When selecting absorbing and shielding materials, it is necessary to choose according to specific circumstances to ensure that the quality and performance of the product meet the requirements. In addition, it is necessary to understand relevant standards and specifications in order to better control the quality and safety of products.
Absorbing and shielding materials refer to a class of materials that have the ability to absorb or reflect electromagnetic waves.
Absorbing shielding materials can be divided into:
Used in the electronic industry, microwave communication and radar systems, and acoustic engineering
Absorbing shielding materialUsed with metal substrates, etc. Common absorbers include zinc oxide, zinc sulfate, and ferrite.
Zinc oxide is the most widely used absorber, appearing as a white powder at room temperature. The refractive index of zinc sulfate is higher than that of zinc oxide, so its absorption coefficient is greater than 1.5 and increases with temperature.
Calcium aluminate (AL2O3) is a new type of high-efficiency absorbing material with high dielectric constant and strong ability to absorb electromagnetic fields.
Lead oxide is a high-performance microwave dielectric, and its loss is frequency dependent. The loss is small in the low frequency band, but rapidly increases with the increase of frequency. Therefore, it is generally used in the high frequency band to improve signal quality.
Boron nitride (BN) is also a good microwave absorber, due to its high refractive index and high density, it has less loss and is suitable for high-frequency bands.
Carbon fiber is a new type of high-efficiency microwave medium developed in recent years, which is a fibrous substance composed of carbon elements. Due to its amorphous nature, it can maintain good uniformity, is not prone to aging, has a long service life, and is currently recognized as the best microwave medium in the world.
