Ferrite is a non-metallic magnetic material, known as iron oxide. Its production process is mainly composed of ferric oxide and other metal oxides. Its relative permeability can be as high as several thousand. The rate is 1011 times that of metal, the eddy current loss is small, and it is suitable for making high-frequency electromagnetic devices. Now it is a non-metallic magnetic material that is widely used in the field of high frequency and weak electricity.
There are also many types of ferrite. Among them, permanent ferrite is also a commonly used material, mainly because it can retain strong magnetic properties for a long time, can be used for a long time and generate a magnetic field, which is also called a permanent magnet Physical reasons.
Ferrite sheet is used as a magnetic film for NFC antennas to resist metal shielding interference and enhance the sensitivity of inductive signal reception. 13.56MHZ antenna ferrite sheet/film is a high-temperature sintered ferrite material. In NFC payment mobile phones and other handheld devices, the main function of the electronic tag is to reduce the absorption of the signal magnetic field by the metal material. At the same time, the ferrite film itself is a high-temperature sintered ferrite material. By increasing the magnetic field strength, it effectively increases Sensing distance.
RFID|NFC anti-metal material ferrite sheet is a kind of functional composite material mainly absorbing electromagnetic waves, eliminating the back and forth reflection of electromagnetic waves in the shielding cavity, reducing the interference of clutter to its own equipment, and effectively preventing electromagnetic radiation from surrounding equipment and Interference and injury of personnel is an advanced means to eliminate electromagnetic wave pollution.
The commonly used thickness of ferrite sheet includes: 0.08mm 0.1mm 0.2mm 0.3mm, NFC ferrite sheet here, magnetic finger flexible magnetic sheet, non-sintered ferrite hard magnetic sheet, it has a soft single-sided adhesive texture. Smooth and ultra-thin thickness ranging from 0.15mm to 0.5mm, the magnetic permeability of NFC ferrite magnets can be as high as 35 at the electromagnetic wave frequency of 13.56MHz. NFC soft magnets have roughly two or one isolation metal functions in NFC devices. To prevent the skin effect of communication waves and metals from consuming electromagnetic energy, and to increase the magnetic "positive energy" (magnetic field strength), the reaction between Reader and a Transponder is highly sensitive and the reading distance is long.