On a modern production line of the CDCJ National Engineering Research Center for Electromagnetic Radiation Control Materials, pieces of magnetic substrate material as thin as cicada wings and business cards are manufactured. Don't underestimate this black magnetic substrate, which is only 2.25 square decimeters in size. It is cut and assembled near the camera on the back of the phone, which can ensure that the phone transmits antenna signals in complex environments, which is equivalent to a sensor connected to the outside world.
This high-permeability magnetic substrate developed by CDCJ for more than 10 years has broken the monopoly market of foreign substrate manufacturers. It is not only used by Amphenol, Foxconn, Huawei, ZTE, Meizu, Xiaomi and other mobile phones, but also sold to dozens of countries such as the United States, Japan and area. With the "Key Technology and Industrialization of High Permeability Magnetic Substrate" project, the company's R & D team recently won the second prize of the National Science and Technology Progress Award in 2018.
"High-permeability magnetic substrates are a new type of electronic substrate material. They have the characteristics of high permeability, thin thickness, and good impedance matching. They are used in the fields of near-field communication, wireless charging, and anti-electromagnetic interference. Previously, China Compared with developed countries in terms of high-permeability magnetic substrate material system integration capabilities and manufacturing process levels, Deng Longjiang said that its main technical difficulty lies in how to solve the problem of shielding and transmitting high-frequency signals from metal emissions and adopting Which process can make the material thinner to meet the requirements of thinning, miniaturization and integration of electronic equipment.
Since 2008, the company's R & D team has carried out a lot of research and experimental work around the key technologies and industrialization of substrate materials, and finally invented a formula system for high magnetic permeability and low loss magnetic substrate materials, and established a fully-compatible water-soluble system Casting process realizes safe, environmentally friendly, efficient and low-cost production.
"At present, we have achieved independent innovation from formula to process, formed independent intellectual property rights, and broke the monopoly of foreign technology." Deng Longjiang said that the high-permeability magnetic substrate developed by the project significantly reduced the material preparation cost through the independently developed water-based casting process. The price of materials is only one-tenth of the price of foreign products.
The project team unites upstream material manufacturers and downstream mobile phone manufacturers to jointly promote the commercial application of domestic magnetic substrates. Through industrial chain cooperation, it has broken foreign patent monopoly on magnetic substrate applications and achieved independent intellectual property rights in material preparation, device design and equipment application. The current daily output of materials can meet the demand for 600,000 mobile phones, and many domestic mobile phone brands are using this material.