Why can electronic fabric serve as the framework for high-end circuit boards?

In an era of soaring AI, 5G, and high-end computing power, a circuit board capable of carrying high-speed signals from chips and stably withstanding high temperatures and pressures is the "heart" of all electronic devices. The key to supporting this heart and determining its performance ceiling often lies hidden inside-a seemingly ordinary electronic-grade fiberglass cloth (electronic cloth). It's not just simple fiberglass cloth; it's the "steel skeleton" and "signal highway" of high-end PCBs. Today, we'll explain in one go why electronic cloth has become an irreplaceable core substrate for high-end circuit boards, focusing on its core performance, industry necessity, and technological barriers.

 

I. Excellent Electrical Performance: The "Stable Steward" for High-Frequency, High-Speed ​​Signals

 

The core requirements for high-end circuit boards (especially those used in AI servers, 5G base stations, and high-speed switches) are: fast signal transmission and minimal attenuation. Electronic cloth perfectly meets these requirements.

 

- Low Dielectric Constant, Low Loss: Ordinary fiberglass cloth slows down high-speed signals and generates heat, while high-end electronic cloth, through high-purity formulas and precision weaving, reduces the dielectric constant (Dk) to below 3.5 and the dielectric loss (DF) to the 0.002 level. Data shows that a 10% decrease in dielectric constant can double signal speed; low dielectric loss significantly reduces transmission loss, ensuring undistorted ultra-high-speed signals of 112Gbps to 1.6Tbps.

 

- Superior Insulation: The electronic cloth itself is non-conductive and has high voltage resistance, effectively preventing short circuits and crosstalk in high-density multilayer circuits, ensuring electrical safety under complex wiring conditions.

 

II. Structure and Thermal Stability: The "Core Skeleton" of the Circuit Board

 

High-end PCBs need to withstand high-temperature soldering, long-term high-load heating, and thermal cycling shocks; not deforming, cracking, or warping is crucial.

 

- Ultra-High Mechanical Strength: Precision-woven from ultra-fine electronic yarn with a single filament diameter ≤9 micrometers, it is thin yet extremely strong, providing rigid support for the PCB and maintaining dimensional accuracy throughout the etching, lamination, and surface mount processes.

 

- Ultra-High Temperature Resistance and Low Thermal Expansion (Low-CTE): With a softening point exceeding 700℃, it can withstand the high temperatures of reflow soldering. High-end Low-CTE electronic cloth has a thermal expansion coefficient of ≤3ppm/℃, exhibiting extremely high thermal compatibility with copper foil and chips. It does not warp or tear at high temperatures, preventing solder joint fatigue failure.

 

- Chemically stable and corrosion-resistant: Resistant to acids and alkalis, humid heat, and aging, ensuring reliable and stable operation of industrial-grade, automotive-grade, and military-grade PCBs for approximately 15 years.

 

III. Adaptable to Advanced Processes: The "Ideal Carrier" for High-Density Integration

 

Currently, PCBs are evolving towards ultra-thin, multi-layered, high-density, and micro-via designs, and electronic cloth perfectly adapts to these advanced processes.

 

- Ultra-thin, uniform, and highly flat: High-end electronic cloths (such as 106 and 1080 ultra-thin specifications) are as thin as tens of micrometers, with uniform fibers and no defects. They are suitable for 10-30 layer high-layer PCBs and HDI high-density PCB lamination, ensuring consistent thickness of each layer and strong interlayer bonding.

 

- Excellent resin wettability: After surface treatment, it perfectly combines with epoxy resin and special resins to form high-strength, highly stable copper-clad laminate (CCL), a core component of PCB substrates.

 

IV. Industry Necessity: Strategic Material for the AI ​​and High-Speed ​​Era

 

With the explosive growth of AI servers, advanced chiplet packaging, and 800G/1.6T optical modules, traditional materials are no longer sufficient. High-end electronic cloth has become a bottleneck material for computing infrastructure.

 

- AI Server Boards: The amount of Q-cloth used per unit is 5 times that of traditional servers, requiring extremely low Dk/Df and extremely low CTE.

 

- Advanced Packaging (CoWoS/FC-BGA): Low-CTE electronic cloth must be used to solve the problems of chip stacking warpage and high thermal stress.

 

- 5G/6G and Millimeter Wave: Only low-dielectric electronic cloth can withstand high-frequency signal loss and ensure stable communication.

Electronic cloth is not a supporting role, but the performance cornerstone, structural framework, and signal guarantee of high-end circuit boards. With its exceptional electrical, thermal, and mechanical properties, it supports the hardware foundation for AI, 5G, and high-end computing. Without high-end electronic fabric, there would be no high-performance PCBs and advanced computing infrastructure.

 

In the future, as materials iterate towards lower Dk, lower CTE, and higher purity, electronic fabric will remain the most core and irreplaceable key substrate for high-end PCBs.