Rogers RO4350B PCB
Rogers RO4350B PCB
Dk 3.48, FR-4 Processing. No MOQ.
RO4350B is the workhorse RF laminate — a woven-glass reinforced hydrocarbon/ceramic material with a tightly controlled Dk of 3.48 (±0.05) and Df 0.0037, yet it fabricates like FR-4. We build genuine Rogers RO4350B in pure and hybrid stackups, with material CoC on every order, from a single piece.
What is Rogers RO4350B?
Rogers RO4350B is a woven-glass reinforced hydrocarbon/ceramic laminate from Rogers Corporation, engineered for high-frequency RF and microwave circuits. It combines a ceramic-filled thermoset hydrocarbon resin system with woven-glass reinforcement to deliver a stable dielectric constant (Dk) of 3.48 ±0.05 at 10 GHz and a low dissipation factor (Df) of 0.0037 — with none of the fabrication headaches of PTFE.
The reason RO4350B became the industry-default RF laminate is FR-4-compatible processing. Unlike pure PTFE materials (which need sodium-etch or plasma through-hole preparation and special lamination cycles), RO4350B fabricates on conventional epoxy/glass equipment. That means standard multilayer lamination, standard plated through-holes, and easy hybrid construction with FR-4 — at a fraction of the cost and lead time of a fully PTFE board.
RO4350B is specified as a high-frequency base material under IPC-4103 (specification sheet for high-speed/high-frequency laminates), and controlled-impedance RF transmission lines on it are designed per IPC-2141. It carries a UL 94 V-0 flammability rating and is RoHS compliant.
Tight Dk Control (±0.05)
The ±0.05 Dk tolerance keeps impedance and electrical phase predictable board-to-board — critical for repeatable RF matching.
Low Loss (Df 0.0037)
A low dissipation factor at 10 GHz preserves your link budget in 5G, radar and antenna-feed designs.
FR-4-Compatible Processing
Standard multilayer lamination and plated through-holes — no PTFE-style special prep. Enables low-cost hybrid stackups.
Thermally Robust
~0.69 W/m·K conductivity (≈3x FR-4), Td ~390°C and low z-axis CTE for reliable high-power operation.
Rogers RO4350B Key Properties
Representative values from the Rogers Corporation RO4350B laminate datasheet. We confirm the exact datasheet build (glass style, copper profile, thickness) for your stackup.
| Property | Value | Why it matters |
|---|---|---|
| Dielectric constant (Dk) | 3.48 @ 10 GHz | Design Dk for RF impedance and wavelength — the number your field solver uses. |
| Dk tolerance | ±0.05 | Tight process window keeps controlled impedance and phase repeatable board-to-board. |
| Dissipation factor (Df) | 0.0037 @ 10 GHz | Low loss tangent protects insertion loss and link budget at high frequency. |
| Thermal conductivity | 0.69 W/m·K | Roughly 3x FR-4 — pulls heat out of high-power RF and radar front ends. |
| CTE, z-axis | ~32 ppm/°C | Low z-axis expansion means reliable plated through-holes in thermal cycling. |
| Decomposition temp (Td) | 390°C | High thermal decomposition point survives lead-free reflow and hot operating environments. |
| Flammability | UL 94 V-0 | Meets flame-retardancy requirements for telecom, automotive and aerospace hardware. |
| Reinforcement | Woven glass + hydrocarbon/ceramic | Rigid, dimensionally stable, and FR-4-compatible to fabricate. |
Why RF Engineers Reach for RO4350B
At microwave frequencies the laminate is the design. Two RO4350B numbers do the heavy lifting: a Dk of 3.48 held to ±0.05, and a Df of 0.0037. The tight Dk tolerance means the impedance you simulate is the impedance you get — your 50 Ω lines, quarter-wave matches and patch-antenna resonances land where the field solver predicted, unit after unit.
The low Df keeps dielectric loss down so your insertion-loss and noise-figure budgets survive the trip from connector to die. Combined with ~0.69 W/m·K thermal conductivity — about three times standard FR-4 — RO4350B moves heat away from power amplifiers and radar front ends instead of trapping it, and its low z-axis CTE (~32 ppm/°C) with a 390°C decomposition temperature keeps plated through-holes intact through lead-free reflow and field thermal cycling.
Crucially, RO4350B gets you most of the RF performance of PTFE laminates without their fabrication cost. It laminates and drills on the same lines as FR-4, so multilayer, blind/buried vias and hybrid constructions are all on the table — which is why it is the default choice for volume RF hardware.
Predictable Controlled Impedance
±0.05 Dk plus tight thickness control lets us hit 50 Ω / differential targets per IPC-2141 with a coupon-verified TDR report.
Heat Handling for High-Power RF
~0.69 W/m·K conductivity and low z-CTE keep PA and radar front ends thermally stable and via-reliable.
Multilayer & Hybrid Ready
FR-4-compatible lamination means RO4350B drops into multilayer and mixed Rogers/FR-4 builds without exotic processing.
Material CoC, No Substitutions
Every order ships with a Rogers Certificate of Conformance and lot number. Spec RO4350B, get RO4350B.
Full Rogers RO Series Comparison
Where RO4350B sits in the Rogers high-frequency lineup. Dk/Df are representative datasheet values at the noted design frequency. Not sure which grade? Our engineers will match the laminate to your band and budget.
| Material | Dk | Df | Best For |
|---|---|---|---|
| Rogers RO4003C | 3.38 | 0.0027 | Lower loss, higher-Q designs — satellite comms front ends, sharp filters, LNA stages. |
| Rogers RO4350B This page | 3.48 | 0.0037 | The default RF workhorse — 5G base stations, radar, antenna feeds. UL 94 V-0. |
| Rogers RO4835 | 3.48 | 0.0037 | RO4350B-class electricals with high oxidation resistance — long-life outdoor antennas & ADAS. |
| Rogers RO3003 | 3.00 | 0.0010 | PTFE-based, very low loss — 77 GHz automotive radar and mmWave. |
| Rogers RT/duroid 5880 | 2.20 | 0.0009 | Lowest loss PTFE/glass — space-grade and phased-array antennas. |
Values are representative of Rogers published datasheets at the noted design frequencies; exact figures depend on glass style, resin content and copper profile. See our full Rogers PCB capabilities for the complete stocked range.
RO4350B Applications
Where RO4350B's stable Dk, low loss and thermal robustness earn their place.
5G Base Stations
Sub-6 GHz and mmWave power amplifier, filter and feed boards where stable Dk keeps impedance matching repeatable in volume.
Radar Systems
Ground, marine and airborne radar front ends that need low loss and heat handling under continuous transmit.
Antenna Feeds & Patches
Patch arrays, feed networks and couplers where the ±0.05 Dk tolerance keeps resonant frequency on target.
Automotive 77 GHz
ADAS radar modules and sensor front ends requiring stable, low-loss, thermally durable RF material.
Aerospace & Defense
Avionics, EW and SATCOM RF assemblies that demand UL 94 V-0 material with a documented CoC.
RF/Microwave Modules
Mixers, LNAs, power dividers and high-frequency interconnect in hybrid RO4350B + FR-4 stackups.
Pure vs Hybrid RO4350B Stackups (Save 40–60%)
Pure RO4350B: every layer is Rogers. Use it when all layers carry RF signals, or when uniform dielectric behavior and thermal expansion across the board are critical — maximum RF consistency, higher material cost.
Hybrid RO4350B + FR-4: RO4350B on the RF signal layers, high-Tg FR-4 on power, ground and digital routing. Because RO4350B uses FR-4-compatible processing, this is a straightforward bonded stackup — and it typically cuts material cost 40–60% versus an all-Rogers build while preserving RF performance on the layers that matter.
If your critical traces live on one or two layers, hybrid is almost always the smart call. Our engineers help you pick the configuration with the best performance-to-cost ratio for your frequency band.
Get Instant QuoteRF on Signal Layers Only
RO4350B on the RF pairs; high-Tg FR-4 on power/ground and low-speed digital.
Lower Material Bill
Hybrid RO4350B + FR-4 cuts material cost 40–60% vs a pure Rogers stackup.
FR-4-Compatible Bonding
No PTFE-style special prep — standard lamination and plated through-holes.
IPC Class 2 & 3
Controlled-impedance RF stackups built to IPC Class 2 or Class 3 with coupon verification.
Genuine RO4350B, Verified on Every Order
Material CoC
Rogers Certificate of Conformance with the RO4350B lot number ships with every order.
Availability Checked
We verify laminate stock before confirming your order — no surprise lead-time extensions.
No Substitutions, Ever
Spec RO4350B and you get RO4350B — never a "similar" grade without your written approval.
AtlasPCB has built RF and high-reliability boards since 2006 for 2,000,000+ customers across 60 countries, with 50+ certified factories, IPC Class 2 & 3 capability, ISO 9001:2015 / IATF 16949 / UL / RoHS, and 99% on-time delivery — from a 1-piece minimum order.
FAQ
Rogers RO4350B Questions
What is Rogers RO4350B?
A woven-glass reinforced hydrocarbon/ceramic RF laminate from Rogers Corporation. Dk 3.48 ±0.05 @ 10 GHz, Df 0.0037, UL 94 V-0 — and unlike PTFE it processes like standard FR-4, so it drops into multilayer and hybrid stackups on conventional equipment.
What is the Dk and Df of RO4350B?
Design Dk is 3.48 ±0.05 at 10 GHz; dissipation factor (Df) is 0.0037 at 10 GHz. The tight ±0.05 Dk tolerance is why RO4350B is trusted for repeatable controlled-impedance RF lines.
RO4350B vs RO4003C — which should I use?
Nearly identical Dk (3.48 vs 3.38), so designs port with minor retuning. RO4003C has lower loss (Df 0.0027) for high-Q front ends; RO4350B is the lower-cost, most popular default for 5G, radar and antenna feeds. Default to RO4350B; step up to RO4003C only when the link budget needs it.
Can RO4350B be built in a hybrid stackup with FR-4?
Yes — RO4350B on the RF signal layers with high-Tg FR-4 elsewhere. Because it uses FR-4-compatible processing, a hybrid build is straightforward and typically cuts material cost 40–60% versus all-Rogers while keeping RF performance where it matters.
Is RO4350B thermally robust and UL 94 V-0?
Yes. It is UL 94 V-0 rated, has ~0.69 W/m·K thermal conductivity (≈3x FR-4), a decomposition temperature (Td) near 390°C, and a low z-axis CTE (~32 ppm/°C) for reliable plated through-holes — suitable for high-power 5G, radar and automotive 77 GHz hardware.
Related: Rogers PCB capabilities (full stocked range), Megtron low-loss laminate (high-speed digital), and the high-frequency PCB service.
Need Rogers RO4350B fabrication?
Genuine RO4350B — Dk 3.48, Df 0.0037, UL 94 V-0 — in pure or hybrid stackups from 1 piece. Material CoC included.