Application limitations of high permeability absorbing materials in RFID/NFC anti metal interference

With the rapid development of modern electronic technology, RFID (Radio Frequency Identification) and NFC (Near Field Communication) technologies are widely used in fields such as electronic tags and payment systems. However, in metallic environments, these technologies are often subject to interference from the "metal eddy current" phenomenon, resulting in poor communication performance. High permeability absorbing materials have become an ideal choice for RFID/NFC to resist metal interference due to their unique electromagnetic properties. However, in practical applications, high permeability absorbing materials also face some limitations. This article will explore these limitations and introduce Advanced Institute (Shenzhen) Technology Co., Ltd. and itsResearch Platinum brand high magnetic permeability absorbing materialApplication in RFID/NFC anti metal interference.

Application principle of high permeability absorbing materials in RFID/NFC anti metal interference

High permeability absorbing materials, through their high permeability characteristics, can effectively reduce metal eddy current phenomena without excessive loss of energy in communication signals. Specifically, the real part of the magnetic permeability (u ') of high permeability absorbing materials can more effectively bundle the magnetic flux of communication antenna signals, reducing or eliminating the phenomenon of "metal eddy currents" generated when the antenna is closely attached to the metal. At the same time, its magnetic permeability imaginary part (u '') is low, which does not cause excessive loss of communication signal energy, ensuring the response and effective recognition distance of communication recognition.

Limitations in the application

1. Frequency limit:
   At present,High permeability absorbing materialWe mainly provide anti metal interference solutions for RFID/NFC with frequencies of 13.56MHz and below. This is because when the magnetic permeability of general absorbing materials is above 10 MHz, the real part u 'of their magnetic permeability will rapidly decay, while the imaginary part u' 'of their magnetic permeability will rapidly rise, thereby affecting their effectiveness in resisting metal interference.

2. Impedance matching issue:
   Absorbing materials first need to allow electromagnetic waves to enter the interior of the material, and then the material provides losses (electrical losses, magnetic losses) to dissipate the energy of the electromagnetic waves. The dielectric properties, magnetic properties, and thickness of a material jointly affect its impedance. Only when the impedance is similar to that of air, can electromagnetic waves enter the interior of the material. The high magnetic permeability of high permeability absorbing materials may result in high impedance, preventing electromagnetic waves from entering the material and effectively absorbing waves.

3. Material properties and processing limitations:
   Ferrite hard plate absorbing materialIt has a high magnetic permeability real part u '(up to about 200), but its preparation process is complex, mechanical properties are poor, product size is limited, and cracks are prone to occur during processing and storage, causing magnetic leakage and affecting actual performance. Although the magnetic permeability of soft magnetic alloy flexible absorbing materials is weak, their flexible size can meet the low loss requirements of product processing, but the market demand is also not low.

4. Antenna resonance frequency offset:
   In the application of RFID/NFC anti metal interference, the insertion of absorbing materials can change the inter line capacitance, impedance, distance and dielectric constant between the antenna and the metal substrate, which may cause the resonance frequency of the card reader or tag antenna to shift and affect the actual communication effect. Therefore, technicians must understand the relevant characteristics of their own absorbing material system to guide customers in adjusting the antenna resonance frequency correctly to achieve the best communication effect.

Advanced Institute (Shenzhen) Technology Co., Ltd. and its research platinum brand high permeability absorbing materials

Advanced Institute (Shenzhen) Technology Co., Ltd. has significant advantages in the field of ultra-high magnetic permeability absorbing materials. The research platinum brand high permeability absorbing material produced by the company not only has a high real part (u ') of magnetic permeability, but also a high imaginary part (u' ') of magnetic permeability, which can effectively reduce electromagnetic radiation and interference. After forming an isolation layer, this material can prevent the propagation of electromagnetic waves, improve the anti-interference ability and electromagnetic compatibility of the equipment.

Research Platinum brand high magnetic permeability absorbing materialBy spraying on the metal parts of RFID/NFC devices, the phenomenon of metal eddy currents can be effectively reduced without excessive loss of communication signal energy. This material has been able to provide effective anti metal interference solutions for RFID/NFC frequencies of 13.56MHz and below, and has been successfully applied in multiple projects.

conclusion

High permeability absorbing materials have significant advantages in resisting metal interference in RFID/NFC, but also face some limitations such as frequency limitations, impedance matching issues, material performance and processing limitations, and antenna resonance frequency offset. Advanced Institute (Shenzhen) Technology Co., Ltd. and its platinum brand high permeability absorbing materials have provided effective solutions for RFID/NFC anti metal interference through technological innovation and high-quality products. In the future, with the continuous advancement of technology and the growing market demand, the application of high permeability absorbing materials in the RFID/NFC field will be more extensive, and the market prospects will also be broader.
The above data is for reference only, and specific performance may vary due to production processes and product specifications.