In the rapid development of 5G communication, automotive radar, and satellite communication, Rogers RO4350B has become the golden substrate for high-frequency circuit design due to its excellent high-frequency performance and cost-effectiveness. This article provides an in-depth analysis of the core features, industry applications, and manufacturing processes of Rogers RO4350B, helping you accurately grasp the trends in high-frequency PCB technology.
Table of Contents
1、 The core technological advantages of RO4350B
1. Ultra low loss and stable dielectric performance
RO4350B maintains a stable dielectric constant (Dk) of 3.48 ± 0.05 at a frequency of 10GHz, with a loss factor (Df) as low as 0.0037. The signal transmission loss is only 1/5 of that of traditional FR-4 materials, making it particularly suitable for harsh scenarios in millimeter wave frequency bands such as 28GHz and 77GHz. Its Dk value fluctuates only ± 0.01 (10GHz to 24GHz) with frequency, ensuring the stability of high-frequency signals.
2. Excellent thermal management capability
The Z-axis thermal expansion coefficient is only 32ppm/℃, and the thermal conductivity coefficient is 0.69W/m · K, which can effectively suppress thermal deformation in high-power applications. Tests have shown that at a frequency of 800MHz, RO4350B can carry 250W of power with a temperature rise of only 77 ℃, far exceeding the 40W/75 ℃ performance of FR-4 material.
3. Process compatibility and cost advantages
Adopting standard epoxy resin/glass cloth process, no plasma pretreatment of PTFE sheet is required, supporting mixed pressure design with FR-4, reducing manufacturing costs by 30%, while meeting UL 94V-0 fire rating.
2、 Industry application scenarios and cases
1. 5G communication base station
-Support Massive MIMO antenna array design, integrating 64 channel antennas within a 50mm x 50mm area to achieve 10Gbps high-speed transmission in the 28GHz frequency band.
-The mixed voltage scheme (Rogers RO4350B+FR-4) balances high-frequency performance and power layer cost control, helping to increase the coverage radius of base stations by 30%.
2. Automotive Electronics and Radar
-In the 77GHz vehicle mounted radar module, combined with laser blind buried hole technology (aperture ≤ 0.15mm), the signal insertion loss is reduced by 15%, and the impedance drift rate under high temperature environment is ≤ 2%, meeting the accuracy requirements of L4 level autonomous driving.
3. Satellite communication and radio frequency identification
-The live broadcast satellite LNB (low-noise module) adopts Rogers RO4350B, with a dielectric constant temperature drift of only 4 ° (-50~150 ℃), ensuring signal stability in extreme environments.
3、 High frequency mixed pressure technology and manufacturing process innovation
1. Vacuum lamination process
High precision combination of RO4350B and FR-4 is achieved at a constant temperature of 170-200 ℃ and a pressure of 200-400psi, with interlayer bubble rate<0.1% and impedance control accuracy ± 5%.
2. Copper foil optimization strategy
-The combination of 0.5OZ (17 μ m) thick copper substrate and 1OZ (35 μ m) surface balances signal integrity and heat dissipation requirements.
-Using electrolytic copper technology, the impedance tolerance of microstrip lines is ± 0.1 Ω to avoid high-frequency phase distortion.
3. Thermal fluid simulation and testing
By using CFD thermal simulation to predict the distribution of hotspots (with an error of ≤ 2 ℃) and optimizing the heat dissipation path with 10oz thick copper process, the temperature rise of MOS tubes can be reduced by 15 ℃.
If you need customized high-frequency PCB solutions, please feel free to contact our engineering team!
