Introduction to the working principle and application of ferrite absorbing materials
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1. The working principle of ferrite absorbing materials
2. Application of ferrite sheet
In handheld devices such as payment mobile phones, the main function of the electronic tag is to reduce the absorption of the signal magnetic field by the metal material, and increase the magnetic field strength to effectively increase the sensing distance. The payment method of the payment mobile phone (NFC) is through 13.56MHz; RFID radio frequency Realized by the recognition system. The RFID smart label of this application is affixed to the back cover of the mobile phone, which can save space to a certain extent. In handheld electronic devices such as mobile phones, electronic tags need to be integrated or attached to the electronic device to function as a component of the device. Often due to limited space, it is inevitable to attach RFID tags (usually passive) to metals, etc. The surface of conductive objects or the place where there are metal devices nearby. As a result, the alternating electromagnetic field induced by the tag under the action of the signal from the card reader is easily attenuated by the eddy current of the metal, which greatly weakens the signal strength, leading to the failure of the reading process. Therefore, in order for the product to be able to better use the card reader, it is necessary to add a microwave absorbing material in the product. Ferrite sheets have begun to be widely used in the field of micro-payment mobile phones and radio frequency.
The shielding box also needs to use ferrite as a shielding material in some low frequency bands, and the overall application of ferrite is still very extensive.
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