With the advancement of electronic design technology and manufacturing process, electronic products are also gradually developing towards the trend of high density, high functionality, light and thin, and high transmission rate. Coupled with the rapid development of chip miniaturization and the increase in the number of data transmissions, the operating frequency of the system is also getting higher and higher, and the use of high-frequency PCB boards is becoming more and more extensive. The following is from: PCB Board Factory: (Juding Circuit Technology), how to choose high-frequency materials for PCB board
High frequency PCB board circuit design, structural design and process technology are the three major elements of electronic product design. To be an excellent electronic product requires not only excellent circuit design, but also good manufacturability, because good manufacturability can reduce problems that occur during mass production of products, shorten product development progress, and reduce design costs. So as to achieve the purpose of improving product competitiveness. Therefore, product design engineers are particularly important in the choice of PCB material when designing electronic products.
With the communication technology from 2G, 2.5G to 3G, and the current 4G, data transmission throughput is getting larger and larger, the bandwidth required is getting wider and wider, the frequency is getting higher and higher, and the miniaturization of equipment is also one of the future development trends. One. Once the device becomes smaller, the circuit board needs to have a higher heat conduction capacity and a higher dielectric constant. High-frequency PCB materials are mainly used in high-power amplifiers, base station antennas, global positioning systems, weather radars and weather satellites, and automotive radars and sensors.
When the operating frequency of the circuit is in the radio frequency band, the range of plates that the design engineer can choose will be greatly reduced. The special formula of the RO4835 high-frequency pcb board plate improves the oxidation resistance. Long-term use at a certain temperature, it can provide particularly stable electrical properties, while maintaining the same processing advantages as FR4 thermosetting resin materials.
At the same time as RO4350B, the dielectric constant (Dk) is 3.48 at 10GHz, the dielectric loss (Df) is 0.0037, and has a low Z-axis thermal expansion coefficient (CTE), ensuring metal vias under various processing and operating conditions Reliability. The X-axis and Y-axis expansion coefficients of this material are similar to copper and have excellent dimensional stability.
When talking about how to choose high-frequency circuit board materials, the main parameters of pcb board materials are Dk and Df. In the circuit board used in high frequency, the stability of the Dk value is the guarantee of the reliability of the board, and the Df value should be as small as possible to reduce signal loss. Moreover, some high-frequency plates are also used in some high-speed, large-scale data transmission systems.
And some products have achieved halogen-free. Since there is no standard for the use of halogen-free plates in the country, there are not many companies that have demand, but Rogers is storing technology for future demand.