Rogers 5880 from the thickness angle: what changes between 5 and 62 mil builds, the full parameter set, the seven application areas and the process steps that keep PTFE under control.
Rogers 5880 is a premium high-frequency laminate built on PTFE with micro glass fibre. It is known for an extremely low dielectric constant and dissipation factor, which makes it suitable for high-frequency and ultra-high-frequency work. Thickness is the variable that changes the most between builds, because it affects stiffness, handling, impedance geometry and to a small extent loss — so it is worth treating as a design decision rather than a purchasing detail. This article covers the parameters, the effect of thickness, the applications and the production guidelines.
The headline figures are stable across the standard thickness range, which is one of the reasons the material is easy to design with: changing the dielectric thickness changes the geometry you need for a given impedance, but it does not change the dielectric constant or the loss figure you should put into the simulation. The table collects the values that appear in most design reviews.
Two of them matter more than the rest in practice. The dielectric constant of 2.20 with a tolerance of ±0.02 gives designers a very predictable basis for impedance, and it is the main reason the material appears in millimeter-wave work. The dissipation factor of 0.0009 is close to the floor of what is commercially available, which is what allows a link to run a long distance across a board before it needs regeneration. Thickness then enters as a mechanical decision with a small electrical side effect. The electrical figures are examined in more depth in our article on the parameters of the RT/duroid 5880 laminate, and the production side of the same material is covered in our piece on 5880 parameters and production guidelines.
| Parameter | Typical Value | Notes |
|---|---|---|
| Dielectric constant (Dk) | 2.20 ±0.02 at 10 GHz | Holds its value across thicknesses, which keeps impedance control precise |
| Dissipation factor (Df) | 0.0009 at 10 GHz | Among the lowest of any laminate; the main reason for the material's reach |
| Standard thicknesses | 0.127 / 0.254 / 0.508 / 0.787 / 1.575 mm (5 / 10 / 20 / 31 / 62 mil) | Thicker boards are stiffer but can add a little loss in some applications |
| CTE, X and Y axes | 17 ppm/°C | Close to copper, which supports dimensional stability through thermal cycling |
| CTE, Z axis | 24 ppm/°C | Keeps multilayer structures reliable through repeated soldering and cycling |
| Water absorption | Below 0.02% | Electrical performance holds in humid conditions |
| Copper foil options | 0.5 oz, 1 oz and 2 oz | Choice depends on current-carrying needs and the achievable line width |
| Thermal conductivity | 0.20 W/m·K | Suits low-power high-frequency circuits; high-power work needs a different grade |
| Flammability | UL 94 V-0 | Meets the safety requirement that most equipment standards expect |
The parameter list makes the electrical decision look settled, which leaves thickness as the variable worth thinking about. It changes three things.
In most projects the choice settles quickly: pick the thinnest dielectric that still gives adequate mechanical support for the connectors and the panel size, unless the design needs extra copper for current or thermal reasons. Recalling the family’s electrical behaviour helps here, and our datasheet comparison of the RT5870 and RT5880 grades is a useful reference point.
The combination of very low loss and predictable electrical behaviour places the material in seven broad areas.
Radar systems, high-precision antennas and guidance hardware all rely on the material when stability in extreme conditions is a requirement rather than a preference. Our article on 5880 as an enabler for high-speed communication systems looks at the same platform from the system side.
Ground station antennas and satellite communication equipment benefit from the low dielectric loss and precise impedance control, both of which raise the efficiency with which a signal is transmitted and received.
Microwave radio links and cellular base station equipment use the material for 5G and millimeter-wave work, where the frequency of operation leaves no room for a substrate that adds loss of its own.
MRI systems and other high-frequency imaging devices depend on stability and low noise, because the signal being measured is small and the board is part of the measurement path. The material’s consistent dielectric behaviour contributes directly to image quality.
Millimeter-wave radar and in-vehicle antenna systems use the laminate where thermal stability and mechanical strength have to survive an automotive environment alongside the electrical requirements.
Network analyzers, spectrum analyzers and other precision instruments depend on the material properties for accuracy, since the board sits inside the measurement chain and any loss it adds is attributed to the device under test.
Amplifiers, mixers and filters use the material because an accurate dielectric constant and a low loss factor are what allow complex circuits to be designed to specification rather than tuned on the bench.
PTFE behaves differently from FR-4, and the process has to be adjusted accordingly. Seven steps carry most of the risk.
Laser cutting or precision mechanical tools are used to avoid edge burrs, and the material’s flexibility means it has to be supported properly to prevent damage. The surface is cleaned after cutting to remove dust and static, since contamination at this stage is difficult to remove later.
Low-speed drilling reduces thermal damage to the hole walls, and support plates prevent delamination or cracking as the bit exits. Plating has to achieve a strong bond between the copper and the PTFE substrate, which is where a weakly activated surface shows up as poor conductivity in the finished hole.
ENIG or silver plating is normally recommended for solderability and corrosion resistance. Excessive chemical reaction temperatures are avoided, because the material deforms when the process runs hotter than it should.
Lamination temperature is kept below 250°C to avoid degrading the material, and pressure has to be applied uniformly. Uneven pressure produces warping or trapped air, both of which are difficult to correct after the fact.
Because the dielectric constant is so low, impedance matching demands higher precision than on a conventional laminate: the line widths required for a given impedance are wider, and small percentage errors have a larger effect on the result. Professional simulation tools such as ADS and HFSS are used to optimise the parameters before the board is built, and consistency is verified afterwards with time-domain reflectometry and network analysis.
Low-temperature soldering materials are recommended to avoid thermal damage to the PTFE substrate, and repeated heating cycles are kept to a minimum to protect the board’s working life. Assembly is normally carried out in a clean environment, since contamination on a low-loss surface can change behaviour at the frequencies these boards operate at.
Two sets of tests close the process. Insertion loss and return loss are measured across the operating frequency range to confirm signal quality, and environmental testing simulates high temperature, high humidity and vibration to establish long-term reliability. The materials comparison behind the laminate choice is set out in our review of Rogers 3003 parameters for designers weighing the alternatives.
Three practical precautions protect the investment made in the material. Store boards in a dry, cool environment away from direct sunlight and high humidity. Avoid bending or excessive pressure during handling, because either can cause delamination or a permanent change in performance. And for boards that stay in service for a long time, carry out periodic electrical and mechanical checks so that drift is detected before it becomes a failure.
Rogers 5880 exists for the part of the frequency spectrum where loss and stability decide whether a system works. Its dielectric constant of 2.20 and dissipation factor of 0.0009 are the source of that capability, the CTE and moisture figures make it dependable in service, and thickness is the design variable that ties the electrical properties to the mechanical reality of a build. Handling it well comes down to process discipline: cutting and drilling the soft material without damage, laminating within its temperature limits, and verifying the result by measurement rather than assumption.
Frequently Asked Questions
A dielectric constant of 2.20 ±0.02 and a dissipation factor of 0.0009, both at 10 GHz, with CTE of 17 ppm/°C in X and Y and 24 ppm/°C in Z, water absorption below 0.02%, and thermal conductivity of 0.20 W/m·K.
The dielectric constant and loss figure stay the same, so the electrical model does not change. What changes is stiffness, the line width needed for a target impedance and, in some applications, a small amount of additional loss on thicker material.
The thinnest dielectric that still gives enough mechanical support for the connectors and the panel size. Extra thickness is only justified when the build needs more copper weight for current or thermal reasons.
Because the dielectric constant is very low, so the trace widths needed for a given impedance are wider and a small percentage error in width moves the impedance further. Simulation and post-build measurement with TDR are both part of keeping it in tolerance.
The process rather than the material. PTFE is soft and chemically inert, so drilling has to be slowed to protect hole walls, lamination must stay below 250°C, and the surface needs proper activation before plating or the copper will not bond reliably.
Send us your frequency plan, target thickness and impedance requirements and we will confirm the stack-up and the process window before you commit the design.
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