Absorbing material is a kind of functional composite material mainly absorbing electromagnetic wave. It can eliminate the back and forth reflection of electromagnetic wave in shielding cavity, reduce the interference of clutter on its own equipment, and effectively prevent electromagnetic radiation from disturbing and harming surrounding equipment and personnel. It is an advanced means to eliminate electromagnetic wave pollution. High permeability absorbing material is a kind of absorbing material with high permeability real part u '(generally ≥ 50) at about 10MHz.
According to their different application fields and problems, they can be divided into two categories
1) For EMC / EMI solutions
It not only needs higher permeability real part u ', but also has higher imaginary part U "(commonly known as" high magnetic loss ").
The higher permeability real part can increase the magnetic flux of the cluster interference source, and the higher permeability imaginary part can effectively convert the cluster magnetic flux into latent heat consumption, so as to reduce or eliminate the electromagnetic radiation interference harm of the interference source.
2) RFID / NFC anti metal interference solution for frequencies up to 13.56MHz
While the real part of permeability u ′ is needed, the imaginary part u ″ (commonly known as "low magnetic loss") is expected to have a higher quality factor (U ′ / u ″).
The higher permeability of the real part can increase the magnetic flux of the antenna signal, which can effectively reduce or eliminate the "metal eddy current" phenomenon when the antenna is close to the metal. At the same time, the low permeability imaginary part U "will not cause excessive loss of the communication signal energy, so as to ensure the response of communication identification and the effective recognition distance.
At present, in the application of anti metal interference of RFID / NFC, absorbing materials can only provide solutions for RFID / NFC with frequencies of 13.56 MHz and below. The reason is that when the permeability of general absorbing materials is more than 10 MHz, the real part u 'of permeability will decay rapidly, while the imaginary part U "of permeability will rise rapidly.
Crystal polymer absorbing material manufacturers currently main absorbing material permeability has ordinary class (jjcj20-50 Series) and high magnetic class (jjcj80-260 Series), welcome to contact us.
Absorbing material: www.goodsmaterial.com