In our PCB design and manufacturing work, Rogers substrate is the go-to choice for high-frequency applications. High-frequency boards rely on high-frequency microwave substrates—process these, and you get high-frequency PCBs.
Boards made with Rogers high-frequency materials (often called Rogers boards) are widely used in communication base stations, antennas, and aviation. Demand is strong, and the market prospect is promising.
As the world’s leading specialty board supplier, Rogers holds over 50% of the global market share and has 20 years of experience in the base station antenna RF field—we’ve seen this reliability firsthand with our clients.
Rogers RO4350 HF Material: Core Features
The Rogers RO4350 substrate is a glass fiber-reinforced (non-PTFE) hydrocarbon/ceramic laminate, built for high-volume, high-performance commercial use.
It’s designed to deliver top-tier RF performance while keeping circuit production cost-effective—low loss, compatible with standard FR4 processes, and competitively priced.
When operating frequencies hit 500 MHz or higher, designers turn to RO4350. It has the features RF microwave developers need: repeatable impedance design for filters, coupling networks, and impedance-controlled transmission lines.
Its low dielectric loss makes it usable in applications where high frequencies limit conventional PCB laminates. It also has one of the lowest dielectric constant temperature coefficients, staying stable across a wide frequency range—ideal for broadband use.
For a deeper dive into RO4350 series performance and upgrades, check out our guide: Rogers 4350B: High-Frequency Laminate Performance & Benefits
Key Processing Advantages of RO4350
Hole Quality & Tool Life
In real production, we judge tool life by hole quality, not just wear. RO4350 delivers great hole quality when drilled with epoxy/glass-compliant drills.
Unlike epoxy/glass, its hole roughness doesn’t increase significantly with these tools—typical values range from 8 to 25 microns, even after up to 8,000 drill hits. This roughness ties to ceramic filler size, creating a good surface for pore wall adhesion. We’ve found drill hits exceed 2,000 while maintaining quality.
Coefficient of Thermal Expansion (CTE)
RO4350’s CTE is similar to copper— a big win for circuit designers. This matching reduces thermal stress during processing and use, preventing board warping or component failure.
Dimensional Stability
Dimensional stability is key for hybrid dielectric multilayers. RO4350’s low Z-axis CTE ensures reliable through-hole quality, even in harsh thermal shock environments.
With a Tg over 280°C (536°F), its expansion stays stable at all circuit processing temperatures. Best of all, it can be processed with standard FR4 techniques—no special sodium etching like PTFE-based materials need.
For a full breakdown of FR4, the industry standard that RO4350 is compatible with, explore our guide: What is FR-4? The PCB Industry Standard & Its Limitations
It’s rigid, thermally stable, and works with automated handling systems.
RO4350 Availability & Compliance
RO4350 laminates come in various 1080 and 1674 glass fabric options, all meeting the same lamination electrical performance specs. They’re a direct replacement for older RO4350 materials, using RoHS-compliant flame retardant technology for UL 94V-0 certification.
These materials meet IPC4003/10 (monolithic RO4003C) and /11 (RO4350) requirements—we confirm this for every batch we use.
RO4350 Fabrication Guidelines
RO4350 is engineered to match woven PTFE glass substrates’ high-frequency performance but simplify manufacturing. It’s a thermoset hydrocarbon/glass fiber-reinforced ceramic laminate with a Tg over 280°C.
Unlike PTFE-based microwave materials, it needs no special treatment—processing and assembly costs are on par with epoxy/glass laminates. Here are our go-to tips for handling RO4350 double-sided PCBs (we use standard epoxy/glass parameters for most cases):
- Inlet/Outlet Material: Use flat, rigid materials (aluminum or 0.254–0.635 mm rigid laminates) to minimize copper burrs. Most conventional inlet materials (with or without aluminum coating) work.
- Maximum Cell Height: The total thickness of the material being drilled (including inlet material and substrate penetration) shouldn’t exceed 70% of the trench length.
- Perforation: Avoid surface velocities over 500 SFM and chip loads under 0.05 mm (0.002″) when possible—this prevents drill damage and ensures consistency.
For high-frequency PCB designs that demand reliability, Rogers substrate (especially RO4350) is unmatched. To inquire about Rogers substrate or get custom fabrication support, contact us at opcba
