What is the Dk of Rogers Ro3003 PCB material?

RO3003 has a process dielectric constant (Dk) of 3.00 ±0.04 measured at 10 GHz / 23°C, and a design Dk of 3.00 that holds remarkably flat up to 77 GHz, which is why it dominates automotive radar designs.

What is white tin finish on a Rogers Ro3003 PCB?

White tin is an immersion / plated tin surface finish that deposits a flat, solderable matte-white tin layer over copper. On RF boards it offers a planar surface for fine-pitch assembly at lower cost than ENIG, though ENIG or immersion silver are often preferred above 30 GHz for conductor-loss reasons.

Is Rogers Ro3003 hard to manufacture?

RO3003 is a soft, ceramic-filled PTFE laminate. It requires PTFE-specific processing: plasma or sodium etch for hole-wall activation before plating, careful handling to avoid dents, and adapted drilling parameters. Most RF-capable fabricators run it routinely, but expect longer lead times and higher cost than FR-4.

What applications use Rogers Ro3003 PCB?

Typical applications: 76–81 GHz automotive radar sensors, 5G mmWave antennas, satellite and SATCOM front-ends, point-to-point microwave links, GPS/GNSS antennas, and low-loss RF test fixtures.

Rogers Ro3003 PCB — Dk 3.00 RF & Microwave Laminate Guide, Calculators & White Tin Finish

01 · Material Data

Rogers Ro3003 PCB material properties

RO3003 is a ceramic-filled PTFE composite engineered for repeatable electrical performance at microwave and millimeter-wave frequencies. The numbers below are the values that actually drive your design — impedance, phase stability over temperature, and loss budget.

ELECTRICAL — WHAT SETS YOUR LINE WIDTHS
Property	Value	Condition
Dielectric constant (process Dk)	3.00 ±0.04	10 GHz / 23 °C
Design Dk (recommended for CAD)	3.00	8–40 GHz, stable to 77 GHz
Dissipation factor (Df)	0.0010	10 GHz / 23 °C
Thermal coefficient of Dk (TCDk)	−3 ppm/°C	−50 to 150 °C
Volume resistivity	10⁷ MΩ·cm	—
Dielectric breakdown	>45 kV	—

MECHANICAL & THERMAL — WHAT SETS YOUR RELIABILITY
Property	Value	Condition
CTE, x / y axis	17 ppm/°C	matched to copper
CTE, z axis	25 ppm/°C	excellent PTH reliability
Thermal conductivity	0.50 W/m·K	—
Moisture absorption	0.04 %	D24/23
Specific gravity	2.1 g/cm³	—
Standard core thicknesses	5 / 10 / 20 / 30 / 60 mil	0.13–1.52 mm

Always confirm values against the current Rogers Corporation RO3003™ datasheet for your build revision. Cladding options: ½ oz, 1 oz and 2 oz electrodeposited copper; rolled copper available for lowest mmWave conductor loss.

02 · Engineering Tools

Rogers Ro3003 PCB impedance & wavelength calculators

Interactive microstrip tools preset with RO3003 design Dk = 3.00. Synthesize a 50 Ω trace width, analyze an existing geometry, and check guided wavelength for your matching networks — directly in your browser, nothing is uploaded.

Microstrip Z₀ Calculator

RO3003 · Dk 3.00

Core thickness h

Trace width w (mm)

Design Dk (εr)

Frequency (GHz)

—Z₀ (ohm)

—εeff

—λg @ f (mm)

—λ/4 length (mm)

// Hammerstad–Jensen closed-form, thin-conductor assumption. Verify final geometry in a 2.5D/3D field solver and with your fabricator's impedance coupons.

50 Ω Quick Reference

Microstrip

—5 mil core → 50 Ω width

—10 mil core → 50 Ω width

—20 mil core → 50 Ω width

—30 mil core → 50 Ω width

// Computed live with the same engine. Rule of thumb on RO3003: 50 Ω microstrip width ≈ 2.4–2.5 × core thickness.

03 · Stackups

Rogers Ro3003 PCB stackup visualizer

Most production Ro3003 designs are either a simple 2-layer RF board or a hybrid where one RO3003 core carries the RF layer and low-cost FR-4 carries digital, power and stiffness. Toggle between the two most common builds.

Cross-Section Viewer

2L · RO3003

Copper RO3003 core FR-4 core Prepreg (RO4450F / FR-4) White tin / finish

2-layer RO3003

Lowest loss, simplest build. RF microstrip on top, solid ground below. Typical for radar antennas, couplers, filters and LNA boards. Core 5–20 mil for mmWave, 30–60 mil below 10 GHz.

4-layer hybrid with FR-4

RO3003 core on L1–L2 for RF; FR-4 on inner/bottom layers for control, power and mechanical rigidity. Cuts laminate cost 40–60 % versus all-PTFE while keeping RF performance.

Bonding & vias

Hybrid builds bond with RO4450F or low-loss FR-4 prepreg. Keep RF vias short, use ground-via fences along transmission lines, and back-drill or blind-via stubs above 20 GHz.

04 · Manufacturing

Manufacturing a Rogers Ro3003 PCB — PTFE process & white tin finish

RO3003 is a soft PTFE system, so it fabricates differently from FR-4. These are the process points that separate an RF-capable shop from a generalist — and the questions worth asking before you place an order.

Drilling & routing

New carbide tooling, reduced chip loads, and entry/exit materials prevent smear and burring in the soft PTFE. Outline milling needs adapted feeds to keep clean edges like the panel pictured above.

Hole-wall activation

PTFE is chemically inert, so hole walls must be plasma treated or sodium etched before electroless copper, or plating won't adhere. This step alone disqualifies many low-cost fabs.

Etching & impedance control

Controlled etch compensation keeps the trace trapezoid within tolerance — at 77 GHz a 10 µm width error shifts Z₀ noticeably. Demand coupon-verified impedance reports.

Lamination (hybrid builds)

RO3003 cores tolerate standard multilayer lamination with compatible prepregs; press profiles are adjusted for the PTFE core's flow behavior and z-axis expansion.

Surface finish

White tin, immersion silver, ENIG or ENEPIG. Finish choice changes conductor loss at mmWave — see the comparison on the right.

SURFACE FINISH ON RO3003 — RF VIEW
Finish	mmWave loss	Cost	Best for
White tin (immersion / plated tin)	Moderate	$	Flat, fine-pitch SMT; cost-sensitive RF up to ~30 GHz; press-fit
Immersion silver	Lowest	$$	77 GHz radar, antennas, lowest conductor loss
ENIG	Higher (nickel)	$$$	Wire bonding, shelf life; nickel adds loss above ~20 GHz
ENEPIG	Higher	$$$$	Mixed wire-bond + solder assemblies

White tin tip: a matte white tin finish gives a planar, solderable surface and avoids ENIG's lossy nickel barrier at lower cost — but specify thickness ≥1 µm and bake requirements to control whisker risk, and prefer immersion silver when every 0.1 dB matters at 77 GHz.

Fab checklist

Ask your fabricator

① Plasma desmear capability for PTFE? ② Impedance coupons with TDR report? ③ RO3003 in stock or 4–6 week laminate lead time? ④ Hybrid lamination experience with RO4450F? ⑤ White tin / immersion silver line in-house?

05 · Selection

RO3003 vs RO4350B vs FR-4 — choosing the right laminate

When the loss budget is tight or the phase must stay put over temperature, RO3003 earns its price. When it doesn't, a cheaper laminate will do. Use this table honestly.

Parameter	Rogers RO3003	Rogers RO4350B	Standard FR-4
Dk @ 10 GHz	3.00 ±0.04	3.48 ±0.05	~4.2–4.6 (varies)
Df @ 10 GHz	0.0010	0.0037	~0.020
TCDk	−3 ppm/°C	+50 ppm/°C	poor / unspecified
Usable frequency	DC – 80+ GHz	DC – ~40 GHz	DC – ~3 GHz (loss-limited)
Processing	PTFE-specific (plasma)	FR-4-like (easy)	Standard
Relative laminate cost	~8–12×	~4–6×	1×
Sweet spot	77 GHz radar, mmWave antennas, phase-critical RF	Sub-6 GHz / X-band, cost-balanced RF	Digital, power, RF below ~2 GHz

06 · Cost

What drives Rogers Ro3003 PCB cost

Expect a 2-layer RO3003 board to land roughly 5–10× an equivalent FR-4 board at prototype quantity. Here's where the money goes — and where you can take it back.

Driver 01

Laminate & utilization

RO3003 panels are the single largest cost line. Tight panelization and choosing standard core thicknesses (5/10/20/30/60 mil) avoids surcharges and 4–6 week material lead times.

Driver 02

PTFE processing

Plasma activation, dedicated drill programs, and slower handling add fab cost. Hybrid RO3003 + FR-4 stackups recover 40–60 % on multilayer designs.

Driver 03

Finish & impedance control

Immersion silver / ENIG cost more than white tin; ±5 % impedance with TDR coupons adds test time. Spec only the tolerance the design truly needs.

Driver 04

Quantity & yield

NRE dominates at qty 5–10; price per board falls steeply to qty 100+. Generous trace tolerances away from RF nets and avoiding 5 mil cores on large panels improve yield.

07 · Applications

Where Rogers Ro3003 PCB is used across the spectrum

RO3003's flat Dk and ultra-low Df keep it useful from L-band to W-band. The ruler below maps its proven application bands — the same chart we use when sanity-checking a laminate choice.

Automotive

76–81 GHz radar sensors

ADAS long/short-range radar antennas and feeds — RO3003's flagship application, qualified across major Tier-1 platforms.

Telecom

5G mmWave & backhaul

28/39 GHz antenna arrays, point-to-point E-band links and low-loss feed networks.

Aerospace

SATCOM & GNSS

Ku/Ka-band front-ends and GPS antennas where phase stability over temperature is mission-critical.

Lab

Test fixtures & couplers

Calibration boards, filters, couplers and launches where repeatable Dk keeps measurements honest.

08 · FAQ

Rogers Ro3003 PCB — engineer FAQ

What Dk should I enter in my CAD / field solver for RO3003?

Use the design Dk of 3.00. Rogers publishes this from microstrip differential phase-length measurement, and it tracks real circuit behavior from 8 GHz through 77 GHz far better than a generic "datasheet Dk". Pair it with Df 0.0010 and your copper roughness model.

Should I choose white tin or ENIG for my Ro3003 board?

Below ~30 GHz, white tin is a cost-effective, flat, solderable finish and avoids ENIG's lossy nickel layer. At 77 GHz and for antenna apertures, immersion silver typically gives the lowest conductor loss. Choose ENIG/ENEPIG when you need wire bonding or long shelf life and can accept the nickel penalty.

Can RO3003 be combined with FR-4 in one stackup?

Yes — hybrid stackups are the norm for production. A single RO3003 core handles the RF layer pair while FR-4 provides digital routing and stiffness, bonded with compatible prepreg such as RO4450F. This typically cuts material cost roughly in half versus an all-PTFE multilayer.

What copper weight and type should I use at mmWave?

½ oz (17 µm) electrodeposited copper is the common default; for the lowest insertion loss at 77 GHz, specify rolled or low-profile copper, since conductor surface roughness dominates loss when the skin depth shrinks below the tooth profile.

How tight can impedance tolerance be on RO3003?

±10 % is routine; ±7 % is achievable with good etch compensation; ±5 % is possible on capable lines with coupon verification, at added cost. The laminate's Dk tolerance of ±0.04 is tight enough that etch control — not the material — is usually the limiting factor.

Where can I get a Rogers Ro3003 PCB quoted and fabricated?

Send your stackup and Gerbers to an RF-capable fabricator with PTFE processing in-house. PCBSync's Rogers Ro3003 PCB service covers 2-layer and hybrid builds, white tin / immersion silver / ENIG finishes, and impedance coupon reports.