Rogers RO3000 rolled copper laminate is a high-performance, high-frequency circuit material introduced by Rogers Corporation. It combines the excellent electrical properties of the RO3000 series of ceramic-filled PTFE composites with the low insertion loss advantages of rolled copper foil, and is specifically optimized for millimeter-wave circuit design.
Rolled copper foil has been incorporated into the RO3003 (low-dielectric constant), RO3035, and RO3203 laminate materials. The smooth rolled copper layer, combined with the RO3000 PTFE ceramic resin material—which features extremely low dielectric loss—enables best-in-class insertion loss in high-frequency circuit materials. These materials are ideal for the stringent loss specifications required in millimeter-wave circuit design, where circuit consistency is critical—such as in automotive radar sensors and point-to-point microwave backhaul communication systems. The RO3003 laminate, with a dielectric constant of 3.0, is a reliable choice for 77 GHz automotive radar sensors. It is now available in versions with rolled copper foil thicknesses ranging from 1/2 oz to 0.040″, which can significantly reduce insertion loss. Below is a detailed introduction to this material:
I. Material Properties
Substrate Type: RO3000 rolled copper laminates utilize a ceramic-filled PTFE (polytetrafluoroethylene) composite as the substrate, offering exceptional electrical properties and mechanical stability.
Rolled Copper Foil: Compared to traditional electrolytic copper foil, rolled copper foil features a smoother surface and more uniform structure, which helps reduce insertion loss in circuits and improve signal transmission quality.
Dielectric Constant (Dk): The RO3000 series offers a variety of dielectric constant options, such as Dk of 3.00±0.04 for RO3003 and 10.2±0.30 for RO3010. These can be customized to meet the specific impedance requirements of various millimeter-wave circuit designs.
Dielectric Loss Factor (Df): This series of materials features an extremely low dielectric loss factor; for example, RO3003 has a Df as low as 0.0010 at 10 GHz, making it one of the lowest-loss types currently available among commercial high-frequency materials. This helps reduce energy loss during signal transmission and improves the signal-to-noise ratio.
Coefficient of Thermal Expansion (CTE): The CTE of RO3000 material in the X and Y directions is comparable to that of copper (approximately 17 ppm/°C), demonstrating excellent dimensional stability; the CTE in the Z direction is 24–25 ppm/°C, ensuring the stability of plated-through holes even under harsh temperature conditions.
II. Application Advantages
Millimeter-wave Circuit Design: RO3000 rolled copper laminates are particularly suitable for millimeter-wave circuit design, such as automotive radar sensors and point-to-point microwave backhaul communication systems. Their low insertion loss and high stability help meet the stringent circuit performance requirements of these applications.
Multilayer Board Design: Since the RO3000 series maintains consistent mechanical properties across different dielectric constants, designers can incorporate materials with varying dielectric constants in multilayer board designs without encountering warping or reliability issues.
Broad-Band Stability: This material maintains stable dielectric constant and loss tangent over a wide temperature range, helping to ensure consistent circuit performance under varying environmental conditions.
III. Processing and Cost
Processing Difficulty: RO3000 rolled copper laminates use a pure PTFE substrate with a smooth surface; standard drilling often results in burrs, requiring adjustments to spindle speed and feed rate. Hole metallization requires additional plasma treatment or sodium naphthalene etching; otherwise, copper plating adhesion will be insufficient. Laminating requires strict control of temperature and pressure, presenting a high technical barrier.
Cost Considerations: Due to the high processing difficulty and superior material properties, the cost of RO3000 rolled copper laminates is relatively high, typically about 10–15 times that of FR-4. Additionally, processing scrap rates are high, resulting in a total cost that is more than double that of mid-to-high-frequency materials such as RO4000. Therefore, this material is more suitable for high-end applications with extreme performance requirements, such as millimeter-wave antennas and aerospace radar systems.