RF wavelength & phase calculator
Calculate free-space and guided wavelength, reference lengths and propagation delay.
INDEPENDENT RF DESIGN REFERENCERogers 4350B.
Rogers 4350B.
Engineered decisions start here.
Calculate a line. Plan a stackup. Understand the material.
A practical RO4350B PCB workbench, from first estimate to fabrication brief.
RO4350B3.66DESIGN Dk · TYPICALWhy not 3.48? →
ENGINEERING WORKBENCH
01 / 07Microstrip impedance
Uncovered surface trace · quasi-static estimate
Results will appear here.
Model limits. Zero-thickness copper model. No mask, roughness, dispersion or connector effects. Frequency sets wavelength only; impedance is quasi-static. Final geometry needs field-solver and fabricator verification. Read the methodology.
01Choose the material model
02Calculate & compare
03Verify with your fabricator
A TOOL FOR THE NEXT DECISION
All 7 tools →Build a better design brief.
RO4350B online stackup design tool
Sketch a 2-, 4- or 6-layer construction and export its dimensions for fabrication review.
Rogers 4350B PCB cost estimator
Build an editable planning budget from board size, quantity and explicit cost assumptions.
MATERIAL DATA, WITH CONTEXT
Full data reference →Know what the numbers mean.
| Property | Value | Measurement basis |
|---|---|---|
| Process dielectric constant | 3.48 ± 0.05 | 10 GHz, 23°C; clamped stripline |
| Design dielectric constant | 3.66 | 8–40 GHz; differential phase length |
| Dissipation factor | 0.0037 | 10 GHz, 23°C; typical |
| Dissipation factor | 0.0031 | 2.5 GHz, 23°C; typical |
| Glass transition temperature | >280°C | TMA; not a continuous-use rating |
| Decomposition temperature | 390°C | TGA; not a reflow setting |
| Thermal conductivity | 0.69 W/(m·K) | 80°C; typical |
The 4 mil core has a separate process-Dk value of 3.33 ±0.05. Typical values are not procurement limits. Read conditions and exceptions.
ENGINEERING KNOWLEDGE
Browse design guides →Follow the question you are solving.
RO4350B dielectric constant: 3.48 versus 3.66
The standard published process Dk is 3.48 ±0.05 at 10 GHz and 23°C
Designing a 50-ohm RO4350B microstrip
A 50-ohm trace width depends on dielectric height, design Dk, conductor thickness, solder mask and neighboring copper
RO4350B and FR-4 hybrid stackups
Hybrid construction can reserve RF material for critical fields while using another laminate elsewhere
Selecting a surface finish for RO4350B
Surface finish selection balances RF loss, solderability, assembly, storage and reliability requirements
RO4350B power-amplifier matching networks
Power-amplifier boards combine RF matching with heat removal, bias distribution and stability requirements
RO4350B versus FR-4: choose by the loss budget
RO4350B provides a defined RF material system, while FR-4 is a broad family with many electrical properties
QUICK ANSWERSBefore you route
Before you route
the first trace.
Resolve common RO4350B decisions with the source and model in view.
What is Rogers 4350B?
RO4350B is a glass-reinforced hydrocarbon/ceramic thermoset laminate used for RF and microwave PCBs. Its electrical behavior depends on the exact construction and test conditions. Read the material overview.
Should I use Dk 3.48 or 3.66?
3.48 ±0.05 is a process-test value; 3.66 is the published design starting value for standard constructions. They are measured differently. Choose a design model.
Can I design a complete PCB in these tools?
The workbench supports preliminary line calculations, stackup sketches and budget planning. It does not generate validated Gerbers or replace PCB CAD and EM simulation. Start a stackup brief.
How do I get a fabrication price?
Use the budget tool to explore assumptions, then send revision-matched fabrication files and requirements to a supplier. Prepare your quotation request.
FROM DESIGN TO FABRICATION
Prepare your RFQ ↗Make the next conversation specific.
Explore Rogers RO4350b fabrication information at RAYPCB. When you have a design brief, request a Rogers 4350B PCB quotation from PCBSync.
Supplier references are external resources. Confirm capabilities, material traceability, prices and delivery directly.