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Rogers RO4350B High-Frequency PCB Material: A High-Performance Solution Designed for Demanding Environments

Dk 3.48, Df 0.0037, Tg above 280°C and CTE 32 ppm/°C with FR-4-compatible processing — why RO4350B is the workhorse laminate for radar, base stations and high-speed digital.

Table of Contents

Rogers RO4350B is a PCB substrate material optimized for high-frequency and microwave applications. Its outstanding electrical performance, thermal stability, and process compatibility make it an ideal choice for high-performance scenarios such as automotive radar, satellite communications, and wireless base stations — the same RO4000-series chemistry covered in our Rogers 4350 fabrication guide.

1. Core Characteristics

  • Excellent Electrical Performance: Features a stable and relatively low dielectric constant (Dk = 3.48 ± 0.05), which benefits impedance control. Its dissipation factor (Df) is as low as 0.0037 at 10 GHz, significantly reducing high-frequency signal transmission loss.
  • Superior Thermal Stability and Reliability: Glass transition temperature (Tg) exceeds 280°C, maintaining performance stability across a wide temperature range. A low Z-axis coefficient of thermal expansion (CTE, 32 ppm/°C) provides good compatibility with copper foil, enhancing the long-term reliability of plated through-holes.
  • Outstanding Environmental Resistance: Excellent resistance to conductive anodic filament (CAF) formation makes it suitable for harsh environments such as high humidity. The material itself meets the UL 94 V-0 flammability rating, complying with stringent safety standards.
  • Excellent Process Compatibility: Manufacturing processes are compatible with standard FR-4, requiring no special treatment. This facilitates high-efficiency, low-cost volume production and offers a variety of thickness options.

2. Key Advantages

  • Balanced Performance and Cost: Delivers RF and microwave-grade performance while being more cost-effective than traditional PTFE materials, and processable through the FR-4-compatible flow described in the RO4000 series overview.
  • Flexible and Reliable Design: Electrical parameters remain highly stable with changes in frequency and temperature, ensuring device reliability under varying operating conditions and supporting complex stack-up designs.
  • High Production Efficiency: Can be seamlessly integrated into existing PCB production lines, significantly reducing processing complexity and accelerating time-to-market.

3. Primary Application Areas

  • Automotive Electronics: Millimeter-wave radar for Adaptive Cruise Control (ACC) and Automatic Emergency Braking (AEB) — the domain explored in our 77 GHz radar laminate analysis — plus vehicle communication modules.
  • Communications Infrastructure: 5G base station antennas and power amplifiers, microwave backhaul equipment, and satellite communication RF front-ends.
  • High-Speed Digital Circuits: High-frequency servers, high-speed switching equipment, and test and measurement instruments.
  • Aerospace and Defense: Radar systems, navigation, and communication equipment.

Summary

Rogers RO4350B, with its low loss, high stability, exceptional reliability, and excellent manufacturability, stands as a key material for addressing the challenges of demanding environments and high-frequency applications. It provides a solid foundation for engineers to achieve high-performance designs in fields such as wireless communications, automotive safety, and high-speed computing.

Frequently Asked Questions

Common questions about Rogers RO4350B.

What are the key specifications of Rogers RO4350B?

Dk 3.48 ± 0.05 for stable impedance control, Df as low as 0.0037 at 10 GHz, glass transition temperature above 280°C, and a low Z-axis CTE of 32 ppm/°C that is well matched to copper foil for reliable plated through-holes.

Why is RO4350B easier to manufacture than PTFE laminates?

Its processes are compatible with standard FR-4 lines and require no special treatment, enabling high-efficiency, low-cost volume production with a wide choice of thickness options — while still delivering RF and microwave-grade electrical performance.

Where is RO4350B most commonly used?

Automotive millimeter-wave radar (ACC, AEB) and vehicle communication modules, 5G base station antennas and power amplifiers, microwave backhaul, satellite RF front-ends, high-speed servers and switches, and aerospace/defense radar and navigation equipment.

How does RO4350B handle harsh environments?

It offers excellent resistance to conductive anodic filament (CAF) formation, which suits high-humidity conditions, and meets the UL 94 V-0 flammability rating for safety compliance.

Specifying RO4350B in Volume?

FR-4-compatible processing, tight Dk control and full impedance verification. Send your stack-up for a fast quote.

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