NFC (Near Field Communication), short-range wireless communication technology, is a short-range wireless communication technology applied to 13.56MHz, which evolved from non-contact radio frequency identification RFID technology. NFC technology is an important innovation in data communication in the global consumer electronics field in recent years. It has attracted wide attention due to its advantages such as wide transmission bandwidth, high security, and low energy consumption. At present, NFC technology is widely used in mobile payment, electronic access control, electronic tags, information sharing, advertising, medical and wireless charging, and has been promoted and used in Japan, the United States, Europe, and so on.
The magnetic substrate material for NFC antenna is a magnetic substrate material for the purpose of providing a strong magnetic path in a limited space. At 13.56MHz, the material has a high magnetic permeability real part and a low magnetic permeability imaginary part (that is, the loss is very high) Low), it is the key material to solve the problem that communication and data exchange cannot be performed after the high-density integration of NFC antennas and metal objects.
The domestic NFC antenna substrate material market has long been occupied by foreign companies such as South Korea's Amotech, Japan's Maruwa, TODA, and TDK. Due to the lack of core technologies in domestic NFC, the integrated design capabilities of antennas and materials are poor, and the lack of system integration capabilities prevents them from participating in the NFC antenna substrate material market competition. For a long time, the market and profits have been monopolized by foreign companies.
The project completion unit has long been engaged in research in this field. Through systematic research on NFC antenna substrate material formulation system, substrate preparation process, NFC antenna application design, NFC antenna and substrate testing technology, etc., it has broken through the technical difficulties of NFC antenna requirements for high magnetic permeability, low loss, and thinness of materials. , Mastered the engineering preparation process of NFC antenna substrate material with independent intellectual property rights, and built a complete system from development to production and application of NFC antenna substrate material.
Technical and economic indicators
The main technical indicators of the NFC magnetic substrate developed in this project are as follows:
(1) Working frequency: 13.56MHz;
(2) Relative complex permeability: μ′≥175, μ ″ ≤3.5;
(3) Surface resistivity: ≥108Ω ∙ cm
(4) Thermal conductivity: ≥1.5W / m • K;
(5) Thickness: 0.06mm ～ 0.3mm (precision 0.005mm), continuously adjustable;
(6) Product size: 48mm × 62mm (adjustable);
(7) Working temperature: -40 ℃ ～ ＋ 85 ℃;
(8) Warpage: ≤0.1mm;
(9) Stability: the deviation of the drift of the operating frequency is within ± 1%
(10) Comply with ROSH and related environmental protection standards.
After localization through this project, breaking the technology monopoly of foreign materials has forced foreign manufacturers to adjust the price of NFC antenna substrate materials, which has fallen from the highest price of 3,000 yuan / square meter to the current 300 yuan / square meter; System design technology; greatly reduce the cost of the domestic NFC industry chain, promote the development of domestic magnetic substrate materials and technologies for NFC antennas, and the industry's international competitiveness.
At present, the products and related design technologies have been applied in batches by internationally renowned enterprises such as Foxconn, Huawei, OPPO, Meizu, Amphenol, Nokia, etc. The material technical indicators have reached the international advanced level, breaking foreign technology monopoly, obvious cost advantages, and replacing imports, directly The economic benefits exceed 100 million yuan, and the indirect benefits exceed 2 billion yuan, achieving very good economic and social benefits.
The magnetic substrate material for near field communication (NFC) antennas is the key to the development of the NFC industry. At the beginning of the project, internationally renowned companies such as the United States 3M, Pulse, Japan TDK, Maruwa, South Korea Amotech and other companies have begun industrialization. The country mainly depends on imports, Profits are monopolized by foreign companies. Key technical indicators such as magnetic permeability are hugely different from foreign countries; domestic does not have batch capacity, and the process level needs to be further improved; domestic NFC antenna and material integrated design capabilities are poor, and lack of system integration capabilities; domestic antenna and material testing technology has not been fully completed Mastery, relevant technical standards are subject to people.
After 8 years of efforts, the project team has three stages: from 2008 to 2010, the development of flaky ferrosilicon; from 2011 to 2012, the formulation of NiZn ferrite substrate materials; from 2013 to the present, cast NFC magnetic substrates and NFC antennas. design. Aiming at the key technical difficulties such as high magnetic permeability / low loss, ultra-thin / high flatness, consistency / batchability of the substrate material, the system carried out research work on the formulation, preparation process, application design and other aspects of the magnetic substrate material of the NFC antenna, forming The main innovations are as follows:
(1) Invented a high-permeability, low-loss NFC antenna magnetic substrate material formulation system.
(2) For the first time, a fully-compatible water-based system casting method has been established and used to prepare magnetic substrate materials for NFC antennas.
Casting box transformation; casting machine exhaust transformation.
(3) Invented a method to improve the material consistency and yield of magnetic substrates for NFC antennas.
(4) Mastered the integrated design technology of NFC antenna magnetic substrate material system.