RO4003C’s baseline numbers, its position against the Rogers family, and the manufacturing economics that make it the volume RF default.
RO4003C earns its place as the default answer in the RO4000 series through three headline values: Dk 3.38 ±0.05 at 10 GHz, Df 0.0027, and a copper-matched CTE that keeps lamination stress low in multilayer builds. It is a ceramic-filled hydrocarbon laminate — not PTFE — which is the source of both its processability advantage and its position in the loss rankings: below PTFE grades but far above FR-4.
Within Rogers’ lineup, 4003C is the tighter-tolerance, lower-loss sibling of RO4350B, trading the latter’s looser Dk spread for a specification aimed at applications where phase consistency matters more than price. Against the RO3003 hybrid constructions used at millimeter-wave, it concedes some loss performance but wins decisively on processing cost. The full selection logic between the series is laid out in our design optimization guide.
The material’s decisive commercial property is that it processes on standard FR-4 infrastructure — no dedicated PTFE pretreatment, no exotic drilling parameters, no special lamination chemistry. That compatibility is what makes the laminate economical at volume, and it is the reason the cost-effectiveness analysis lands where it does: the premium over FR-4 buys RF performance without the process premium PTFE demands. Impedance holds ±5% through normal production variation, and the material accepts ENIG, OSP, and HASL finishes without electrical penalty in its typical frequency range.
Sub-6 GHz 5G base station antennas and filters use 4003C where its Dk stability keeps passband edges where they were designed. Automotive radar at 77 GHz pushes the material to its practical frequency ceiling — workable, but with less margin than PTFE constructions. Ka-band satellite phased arrays use it in hybrid stacks where cost discipline matters. The antenna-side design constraints are expanded in our 5G base station materials analysis.
Three specification habits protect a 4003C program. Verify the fabricator’s Rogers authorization — the market sees counterfeit and mixed-lot laminate more often than buyers expect. Require 10 GHz VNA coupon data per lot, not just datasheet citations. And if the design uses hybrid stacking — 4003C RF layers over FR-4 digital layers — confirm the shop has reconciled the CTE step in their lamination profile, since that junction is where delamination risk concentrates.
Frequently Asked Questions
Dk 3.38 ±0.05 and Df 0.0027 at 10 GHz, with a copper-matched CTE that keeps multilayer lamination stress low.
4003C offers tighter Dk tolerance and slightly lower loss; 4350B trades that for cost and is the more common pick below 10 GHz.
It processes on standard FR-4 infrastructure — no dedicated PTFE pretreatment or exotic drilling — so the laminate premium buys RF performance without process premium.
The fabricator's Rogers authorization, per-lot 10 GHz VNA coupon data, and — for hybrid stacks — a lamination profile that reconciles the CTE step to FR-4.
Send your frequency, layer count and cost targets and we will return a material recommendation with the trade-offs quantified.
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