With the increase of power density of electronic devices, the electromagnetic compatibility problem of electronic devices is becoming more and more serious, and the absorber sheet with shielding function has become a new trend to solve this problem.
Absorber sheet refers to a type of material that can absorb this part of the energy and form reflection, refraction and scattering when electromagnetic wave energy is projected on its surface. At the moment when electromagnetic wave interference is becoming more and more serious, it is difficult to solve this problem only by commonly used shielding materials or changing the design of the circuit, so the more widely used absorber sheets are particularly attractive.
Definition and role of absorber sheet
Absorber sheet refers to a type of functional material that can absorb and attenuate the electromagnetic wave energy incident in space, and reduce or eliminate the reflected electromagnetic wave. It is generally composed of a matrix material and a lossy medium. The energy of microblogging is absorbed and consumed by small polar molecules. According to the law that electromagnetic waves propagate in the medium from low magnetic to high magnetic permeability, high-permeability ferrite is used to guide electromagnetic waves, and through resonance, a large amount of radiation energy of electromagnetic waves is absorbed, and then the energy of electromagnetic waves is converted into heat energy through coupling.
Electromagnetic waves induce a current in the material, and the current is blocked from being transmitted inside the material and converted into internal energy. The greater the conductivity, the greater the macroscopic current induced by the carriers (electric current induced by electric field and eddy current induced by magnetic field), which is favorable for the conversion of electromagnetic energy into thermal energy.
The absorber sheet is mainly a shielding film based on ferrite. Its main function is to absorb coupled electromagnetic waves to prevent the superposition of radio waves and eliminate redundant radio waves in the intelligent electronic system. The absorber sheet can be cut into shape and attached to the back of the touch panel. Or anti-electromagnetic interference EMI on the cable to optimize the performance of the touch screen.
The principle of absorber sheet
- The principle of absorber sheet is to use magnetic microwave absorbent as the main body to convert the electromagnetic wave of electronic equipment into heat energy in the form of insulation loss, magnetic loss and resistance loss to reduce electromagnetic radiation. It has high magnetic permeability and wide selectable frequency bands. and other characteristics, and can be developed for specific frequency bands.
- The absorber sheet has good absorption characteristics in the range of 10MHz~6GHz, which can avoid electromagnetic interference or leakage caused by secondary reflection. The products are mainly absorbing patches, and can also be processed into various shapes according to customer needs. The absorber sheet can be used inside the cavity of electronic equipment such as notebook computers, mobile phones, communication cabinets, etc.
- The absorber sheet has good electromagnetic wave absorption effect and wide absorption frequency. It can be customized according to the frequency band required by customers. It is thin and cost-effective, and has a wide range of uses and applications.
Application of absorber sheet
- It can be used in the cavity of electronic equipment such as notebook computers, mobile phones, communication cabinets, etc.
- It can reduce the radiation and noise of various electronic devices.
- It can reduce the coupling conduction radiation interference between low frequencies and reduce the low frequency echo interference
- It can reduce the internal EMI (resonance, crosstalk) in the barrier frame.
- It is applied between the chip and the cooling module.
- Applied to EMI/RFI: Three elements of electromagnetic interference: interference source, interference propagation path and sensitive equipment. The source of interference refers to the electronic equipment or system that generates electromagnetic interference. The interference propagation path includes cables, space, etc., and the sensitive equipment refers to the electronic equipment or system that is easily affected by electromagnetic interference. Transmit frequency interference: Radio frequency is a high-frequency alternating current, also known as electromagnetic waves. Radio frequency interference is the interference caused by electromagnetic waves. If two electromagnetic waves with similar frequencies will be received by the receiver at the same time, it will cause interference. There will be harmonic interference near the transmitter. interfere with other receiving equipment. Electromagnetic waves at the same frequency can interfere with the radio.
Through the above introduction, you should have a general understanding of the absorber sheet. If you have any questions about the absorber sheet, please contact Shenzhen PH Functional Materials, and our professional engineers will answer it for you. As a professional sheet absorbing material factory, we focus on the research and development, production and sales of wave absorbing materials and sheet electromagnetic shielding coatings. Our products have strict quality control standards and stable quality. All products have passed SGS hazardous substance testing and meet global supply standards. Our vision is to lead the progress of China’s sheet absorbing materials and electromagnetic shielding coatings industry. Provide customers with high-quality sheet absorbing materials and electromagnetic shielding coatings. Become a world-renowned supplier.
