The 5880 figures that matter in a design review, the applications they suit, and the production steps that decide whether the board delivers the data sheet values.
Rogers 5880, also written as RT/duroid 5880, is one of the most widely specified high-frequency laminates in the industry. Its combination of a very low dielectric constant, extremely low loss and good dimensional behaviour under heat is what makes it a default choice for radar, satellite and millimeter-wave work. This article collects the parameters that matter, the applications they suit, and the production practices that keep the material performing as specified.
The figures below are the ones most often requested in a design review, and they are worth knowing before the material is committed to a stack-up.
The material machines, drills and cuts easily, which shortens the learning curve for a shop that already runs PTFE laminates. Full figures are collected in our 5880 parameter reference.
Because the electrical properties are stable rather than merely good, the material fits applications where a specification has to be held over temperature, frequency and time.
Most of the performance risk on a 5880 build sits in the process rather than the material. The steps below are the ones that decide the outcome, and they are covered in more detail in our notes on manufacturing 5880 high-frequency boards.
Impedance has to be calculated during layout, not corrected afterwards, because the material leaves little room for tuning. The stack-up then fixes dielectric thickness and copper weight together; light copper, typically half an ounce, is the usual starting point on a loss-sensitive design. Both decisions belong in the same conversation as the frequency plan.
Laser cutting or precision mechanical tooling avoids the burrs and edge damage that general-purpose machining produces. Deburring after cutting is standard practice. In drilling, the softness of the material is the dominant factor: speed and feed have to be controlled to prevent overheating, and rough hole walls have to be avoided or plating quality suffers downstream.
The close match between the material’s CTE and copper is a real advantage here, because it reduces the risk of delamination and warping under press. Low-temperature lamination is preferred so that the dielectric properties are not disturbed by the process itself.
Gold plating, ENIG and OSP are all used to improve solderability and corrosion resistance. What matters more is what to avoid: high-temperature chemical treatments can deform the material or degrade its properties, so the finish should be chosen with the same care as the laminate. The general options are compared in our guide to 5880 in high-speed communications, which covers the same platform in a different application context.
Final verification uses a high-frequency network analyzer to confirm dielectric performance and signal integrity. Impedance consistency, loss figures and the electrical integrity of plated through-holes should all be measured before the batch is released, and the checks in our overview of production challenges with 5880 are a useful checklist for what tends to go wrong.
The material is flexible, so excessive bending or impact should be avoided in handling. High-precision builds are better processed in a cleanroom, because contamination on the surface affects performance. Boards should be stored in sealed packaging away from high temperature and humidity. None of this is unusual for a PTFE laminate, but it is easy to overlook once the design is finished.
5880 is specified because its numbers are unusually good and unusually stable, and the way to keep that advantage is to treat the process as part of the design. Impedance calculated during layout, a stack-up that respects the frequency plan, controlled drilling, low-temperature lamination and a finish that does not damage the dielectric: taken together, these are what let a board deliver the 2.20 Dk and 0.0009 Df that the data sheet promises.
Frequently Asked Questions
Its combination of a very low Dk of 2.20 and a very low Df of 0.0009, with a CTE that closely matches copper. The numbers are stable across frequency and temperature, which is what makes the material predictable enough for millimeter-wave work.
It raises propagation velocity, so a signal spends less time in the trace. On a phase-critical design that frees delay budget for the rest of the channel rather than being consumed by the board.
It machines and cuts easily, and its CTE match with copper reduces warping risk during lamination. The steps that need attention are drilling, because the material is soft, and the choice of surface finish, which must avoid high-temperature chemistry.
Half an ounce is the usual starting point on loss-sensitive boards. Heavier copper helps with current and thermal spreading but increases conductor loss at high frequency, so the choice follows from the link budget.
With a high-frequency network analyzer, checking impedance consistency, loss and the electrical integrity of plated through-holes. Measuring the board rather than trusting the data sheet is what closes the loop.
Send us your stack-up, impedance targets and frequency plan and we will confirm the process window before the boards are released.
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