Noise suppression sheet—In recent years, various electronic devices represented by smartphones have been miniaturized and thinned, and various functions such as NFC and contactless power supply have also been developed. As a result, high integration inside equipment has been further developed, and an effective noise suppression effect is increasingly required in terms of noise countermeasures. Noise countermeasures are implemented through the circuit design on the board and various electronic components mounted thereon. In addition, it is necessary to suppress the radiation of unintended and unnecessary noise. By using a magnetic sheet that absorbs noise and converts it into heat, it is necessary to prevent noise from leaking to the outside of the device and internal reflections that affect other components.
Electromagnetic noise suppression sheet is a flexible impact-resistant soft magnetic material made of magnetic materials and resins. It is an electromagnetic noise suppression product that can suppress radiated magnetic sounds generated by electronic equipment within a wide frequency range. Electromagnetic noise suppression sheet has the characteristics of wide application frequency range, convenient mounting, high processing flexibility, flexibility, conductivity, noise reduction, etc. It is widely used in smart phones, notebook computers, automotive electronics, air conditioners, wireless chargers and other fields. In recent years, as the penetration rate of electronic equipment continues to increase, the market demand for electromagnetic noise suppression sheets is gradually released.
Electromagnetic interference can easily cause information errors, equipment failures, and fires. Serious electromagnetic radiation has a great impact on the environment and human body. At present, electronic equipment has become an indispensable part of residents’ lives, and the wide application of electronic equipment brings more and more electromagnetic interference. With the improvement of consumers’ safety awareness, electronic equipment demagnetization and noise reduction have become the focus of industry research. The market attention of electromagnetic noise suppression sheets has increased. At the same time, with the advancement of science and technology, the market has higher requirements for the performance, quality and volume of electromagnetic noise suppression sheets, and the electromagnetic noise suppression sheet industry is gradually upgrading to the direction of ultra-thin, miniaturized, and high-efficiency.
According to the thickness of the product, the electromagnetic noise suppression sheet can be divided into types higher than 0.1mm, 0.05mm-0.1mm, and 0-0.05mm. Among them, electromagnetic noise suppression sheets higher than 0.1mm are the mainstream products in the current market, accounting for nearly 44% of the market. From the perspective of market application, electromagnetic noise suppression sheets are mainly used in the field of consumer electronics, accounting for about 37%.
According to industry analysts, in recent years, with the popularization of electronic equipment, electromagnetic interference has become more and more serious, the market demand for electromagnetic noise suppression sheets has increased, and the future development of the industry is broad. At the same time, with the advancement of science and technology, electronic equipment is changing towards ultra-thin and miniaturized. Under this background, the market’s requirements for electromagnetic noise suppression sheets are also gradually increasing. The development of the electromagnetic noise suppression sheet industry is also constantly upgrading in the direction of ultra-thin, miniaturized, and high-efficiency.
Application Mechanism Analysis of Electromagnetic Noise Suppression Sheet
The application of electromagnetic noise suppression sheets is similar to that of absorbing materials, but their application mechanisms are different. The absorbing material is mainly aimed at electromagnetic waves, placed in the path of electromagnetic wave transmission, and requires wave impedance matching, because its wave impedance has nothing to do with the nature of the wave source and the distance from the wave source, so its absorbing energy can be analyzed from the perspective of wave impedance. The electromagnetic noise suppression sheet is mainly aimed at the radiation source and is mounted at the radiation source, requiring magnetization or dielectric polarization loss. Because the wave impedance is related to the nature of the wave source and the distance from the wave source, it is difficult to calculate and analyze the absorbing energy from the angle of wave impedance.
Characteristics of Electromagnetic Noise Suppression Sheet
Electromagnetic noise suppression sheet, has the following characteristics: wide application frequency range (30 MHz ~ 10 GHz), operating temperature range (-40 ~ +130C), good electromagnetic noise suppression effect (level is -4dB, IEC62333 microstrip line test method) , large thermal conductivity (some models have a thermal conductivity of 0.8 W/(m. K)), while the air thermal conductivity is 0.023W/(m. K), the surface resistance is greater than 1 MQ, and it is flexible, easy to cut, and convenient to mount.
To sum up, electromagnetic noise suppression sheets, in terms of structure, mainly have three types of products: single-layer, multi-layer with high thermal conductivity. Each type is divided into several models according to thickness and application frequency range, and the thickness ranges from 0.1 to 1.0 mm.
The application of electromagnetic noise suppression sheets on electronic equipment mainly has the following methods
- Mounted in the shielding box to absorb the electromagnetic wave reflection of the shielding box and reduce the interference to components;
- Applied between circuit boards or components, using noise suppression sheets to construct magnetic paths to reduce electromagnetic coupling;
- Directly mounted on the high-frequency current line of LSI, IC chip or circuit board to suppress high-frequency electromagnetic radiation;
- Apply flexible circuit board FPC to suppress the conducted radiation of the cable. The product is widely used in mobile digital cameras, digital video cameras, notebook computers, scanners,CD\DVD, PDA, car navigation system, etc.
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