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1.Electrodeposition Principle

Rolled copper is produced through consecutive cold rolling processes. Beginning with a pure - copper billet, these operations decrease the copper's thickness and increase its length. The surface smoothness of the rolled copper is determined by the condition of the rolling mill.

2.1 Conductivity: Rolled copper offers excellent electrical conductivity, ensuring stable signal transmission on PCBs, reducing loss and interference, and enhancing device efficiency, especially in high - frequency applications.

2.2 Heat dissipation: Its strong thermal conductivity quickly dissipates heat from components, preventing overheating and improving PCB reliability.

2.3 Mechanical properties: With high flexibility and bending resistance, it suits flexible PCBs in wearable and foldable devices, maintaining circuit integrity.

3. Influencing factors

3.1 Purity: Higher purity means better conductivity; impurities degrade performance, and high - purity copper meets high - end needs.

3.2 Thickness: Uniform thickness ensures consistent PCB performance; unevenness can cause issues like uneven heating.

3.3 Surface: A smooth surface improves adhesion and reduces signal issues, while roughness affects quality and manufacturing.

4.General Introduction of Rogers CuClad® 217 PCB

Speaking of rolled copper, it reminds me of the Rogers CuClad 217 high - frequency PCB. Let's learn about this high - performance laminate together. CuClad 217 Substrate features a low fiberglass/PTFE ratio, resulting in the lowest dielectric constant (2.17, 2.20) and dissipation factor (0.0009) among fiberglass-reinforced PTFE laminates. These characteristics enable faster signal propagation and improved signal-to-noise ratios.

4-1. Dissipation Factor vs. Frequency for Cuclad 217

This chart shows the stability of the dissipation factor of CuClad® 217 PCB across different frequencies.This characteristic demonstrates the inherent robustness of Rogers’ laminates across frequency, providing a stable platform for high frequency applications.

Now let us explore CuClad® 217’s characteristics and advantages when using Rolled (rolled copper foil):

4.1 Characteristics

Copper foil thickness specifications:  the Rolled copper foil of CuClad® 217 is available in two common specifications, 1 oz (35μm) and ½ oz (18μm), which can meet the requirements of different PCB designs for copper foil thickness. For example, a thicker copper foil can be selected for circuits with high current - carrying capacity requirements.

Surface roughness: For the two thickness specifications, the surface roughness of the Dielectric Side (dielectric surface) is 0.4μm, and that of the Top Side (top surface) is 0.3μm. The relatively low and stable surface roughness is beneficial to improving the bonding force with other material layers and the stability of electrical performance.

4.2 Advantages

Electrical: Low - roughness Rolled copper foil cuts signal transmission loss and impedance fluctuations. In high - freq circuits, its smooth surface reduces scattering and reflection, ensuring integrity. This gives CuClad® 217 an edge in high - speed comms and RF fields.

Mechanical: Produced via multiple rolling, it has a denser structure, better flexibility and ductility. In flexible PCBs needing bending, it endures more cycles without damage, outperforming other foils and extending PCB life.

Reliability: Stable roughness and good properties strengthen the bond between foil and substrate in CuClad® 217, reducing delamination. This boosts PCB reliability, making it ideal for aerospace and automotive electronics.

In the cutting - edge field of high - frequency PCBs, Rolled copper is the well - deserved vanguard. Using the reduction of signal loss as a sharp blade and excellent mechanical reliability as a sturdy shield, it breaks through technological constraints and leads the high - frequency electronics field towards a smarter and more efficient future.

Founded in 2003, Shenzhen Bicheng Electronics Technology Co., Ltd is an established high frequency PCB supplier and exporter in Shenzhen, China, serving customers worldwide.

We are devoted to delivering high-frequency PCB products and solutions of the highest quality, along with customized service. Feel free to consult and contant at any time !

Visit https://www.bicheng-enterprise.com to learn more.

Unlock its full potential by contacting Vicky at v.xie@bichengpcb.com.