How Does RT/duroid 5880 Compare to Woven Fiberglass PTFE Laminates?

Introduction

In the most demanding high-frequency and millimeter-wave applications—where signal integrity, minimal insertion loss, and consistent electrical performance are paramount—material selection becomes the single most critical design decision. Rogers RT/duroid® 5880 represents the gold standard in ultra-low-loss PTFE-based laminates, delivering the lowest electrical loss among reinforced PTFE materials while maintaining exceptional dielectric constant uniformity.

Designed for exacting stripline and microstrip circuit applications, RT/duroid 5880's randomly oriented glass microfibers result in exceptional dielectric constant uniformity—both from panel to panel and across a wide frequency range. Its extremely low dissipation factor extends the material's usefulness to Ku-band, millimeter-wave frequencies, and beyond, making it a trusted choice for aerospace, defense, and advanced communications systems.

This article provides a comprehensive overview of RT/duroid 5880 laminate properties, a detailed 2-layer PCB design example, and key sourcing information for engineers and procurement professionals.

What Is Rogers RT/duroid 5880 Laminate?

Rogers RT/duroid 5880 is a glass microfiber-reinforced PTFE (polytetrafluoroethylene) composite specifically engineered for high-frequency circuit applications. Unlike woven fiberglass-reinforced PTFE materials, RT/duroid 5880 utilizes randomly oriented microfibers, which eliminate the dielectric constant anisotropy and non-uniformity that can occur with woven reinforcements.

This unique construction results in:

Isotropic electrical properties – Consistent Dk regardless of orientation

Exceptional Dk uniformity – 2.20 ± 0.02 from panel to panel

Stable performance across frequency – Dk remains constant from low frequencies to millimeter-wave

Ultra-low dissipation factor – 0.0004 to 0.0009 @ 10 GHz, among the lowest for any reinforced PTFE material

Key Differentiator: The Lowest Loss in a Reinforced PTFE Material

RT/duroid 5880 offers the lowest dissipation factor of any reinforced PTFE laminate available today. With a Df as low as 0.0004 at 1 MHz and 0.0009 at 10 GHz, it outperforms woven fiberglass PTFE materials (like DiClad 527, Df ≈ 0.0017) and hydrocarbon ceramic materials (like RO4835, Df ≈ 0.0037). This ultra-low loss characteristic makes RT/duroid 5880 the material of choice for applications where every fraction of a dB of insertion loss matters—including satellite communications, millimeter-wave radar, and high-performance test equipment.

Properties of RT/duroid 5880 Laminate

Notes:

1. Specification values are measured per IPC-TM-650 method 2.5.5.5 at ~10 GHz, 23°C. Testing based on 1 oz. electrodeposited copper foil.
2. The design Dk is an average number from several different tested lots of material on the most common thicknesses.
3. Typical values should not be used for specification limits, except where noted.
4. SI units given first with other frequently used units in parentheses.

A certificate of conformance containing lot-specific data accompanies each shipment.

Features and Benefits Summary

Standard Offerings

RT/duroid 5880 laminates are available in a comprehensive range of thicknesses, panel sizes, and copper cladding options.

Standard Panel Sizes & Claddings

2-Layer PCB Design Example Using RT/duroid 5880

To demonstrate the practical application of RT/duroid 5880, the following is a complete 2-layer rigid PCB design case.

PCB Design Specifications

Design Observations

This larger board (102 mm × 65 mm) features a relatively high component count (46 components) and a significant number of vias (29 vias) despite having only 2 nets.

Key observations include:

High via density – Frequent grounding or shielding vias, typical of sensitive microwave designs operating at millimeter-wave frequencies

No solder mask – Preserves the ultra-low-loss characteristics of RT/duroid 5880; solder mask would introduce additional dielectric loss

No silkscreen – Maintains a clean RF surface; avoids contamination

ENIG surface finish – Provides excellent solderability and flatness; suitable for fine-pitch SMT components

RT/duroid 5880's ultra-low loss (Df ≈ 0.0009) – Critical for maintaining signal integrity at Ku-band and millimeter-wave frequencies

IPC-Class-2 compliance – Ensures reliability for commercial aerospace and defense applications

Manufacturing Process Highlights

Easily machined – RT/duroid 5880 laminates can be cut, sheared, drilled, and milled using standard PTFE processing techniques

Excellent chemical resistance – Resistant to all solvents and reagents used in etching circuits or plating edges and holes

Fine-pitch capability – 4/6 mil trace/spacing supports high-density millimeter-wave circuit layouts

100% electrical testing – Guarantees functional integrity of every board

Typical Applications

•Commercial Airline Broadband Antennas

• Microstrip and Stripline Circuits

• Millimeter Wave Applications

• Radar Systems

• Missile Guidance Systems

• Point to Point Digital Radio Antennas

Conclusion

Rogers RT/duroid 5880 laminates represent the pinnacle of ultra-low-loss PTFE-based materials for high-frequency and millimeter-wave applications. With a dielectric constant of 2.20 ± 0.02 and a dissipation factor as low as 0.0009 at 10 GHz, RT/duroid 5880 delivers the lowest electrical loss of any reinforced PTFE material available today.

Key advantages include:

Ultra-low loss (Df = 0.0004 – 0.0009) – Enables operation at Ku-band and millimeter-wave frequencies

Exceptional Dk uniformity (2.20 ± 0.02) – Predictable impedance control; consistent performance

Isotropic properties – Random microfiber reinforcement eliminates Dk anisotropy

Stable performance across frequency – Constant Dk from low frequencies to >40 GHz

Low moisture absorption (0.02%) – Negligible performance drift in humid environments

NASA low-outgassing – Suitable for aerospace and space applications

V-0 flammability – UL 94 compliant for safety-critical systems

Easy machinability – Can be cut, sheared, drilled, and milled using standard methods

Whether used in radar systems, satellite communications, millimeter-wave backhaul, or high-performance test equipment, RT/duroid 5880 provides the ultimate low-loss foundation for demanding high-frequency circuit designs.