What 5G brings to us is the transmission speed beyond mobile fiber (Mobile Beyond Giga), the real-time capability of industrial buses (Real-Time World), and all-online connection (All-Online Everywhere). 5G will start an era of opportunities.
From the perspective of 5G construction requirements, 5G will adopt the "macro station + small station" network coverage model. Previous upgrades of base stations will bring a round of reconstruction of existing base stations and a wave of new base station construction. The massive growth of 5G base stations will drive a large increase in the application of components such as PCBs, antennas, and filters.
In 5G base stations, a printed circuit board (PCB) is widely used as the most basic connection device.
The substrate material widely used in the PCB industry is glass-fiber cloth-reinforced epoxy-based substrate FR-4 (epoxy glass-fiber cloth copper-clad board). Cloth composition.
Glass fiber cloth and special resin are one of the important raw materials of PCB. Glass fiber cloth as a reinforcing material plays the role of insulation and increased strength; special resin as a filler material plays the role of bonding and improving the performance of the board.
In order to meet the requirements of reliability, complexity, electrical performance, and assembly performance of high-frequency and high-speed PCB products, many manufacturers of PCB substrate materials have made different improvements to special resins.
In the current trend of high-speed and high-frequency, more mainstream PCB materials include polytetrafluoroethylene resin (PTFE), epoxy resin (EP), bismaleimide triazine resin (BT), and thermosetting cyanate resin. (CE), thermosetting polyphenylene ether resin (PPE), and polyimide resin (PI), resulting in more than 130 types of copper clad laminates.
For the base station PCB, the most important indicators are the dielectric properties, signal transmission speed, and heat resistance. The first two points of the PTFE substrate have good performance.
It is the organic material with the best dielectric properties found so far. The excellent dielectric properties are conducive to the complete and rapid transmission of signals. In this respect, PTFE is the preferred resin material for 5G base station PCB boards.