PCB & PCBA Frequently Asked Questions

What makes an RF PCB different from a standard PCB?

An RF PCB must control physical structures that directly affect signal behavior. Material Dk / Df, dielectric thickness, copper profile, trace geometry, reference planes, via transitions, grounding, shielding and connector launch areas can all affect impedance, insertion loss, return loss and repeatability.

How should I choose RF PCB materials such as Rogers, PTFE or hybrid stackups?

RF PCB material selection should be based on frequency, insertion loss budget, trace length, impedance target, phase sensitivity, thermal requirements, cost and production yield. Rogers, PTFE, ceramic-filled and hybrid stackups should be reviewed based on the real application, not frequency alone.

Why does RF PCB performance change after fabrication?

RF PCB performance can change when the manufactured board differs from the design or simulation assumptions. Dielectric thickness, copper roughness, etching tolerance, trace width, via transitions, connector launch, grounding continuity and assembly quality can all affect impedance, insertion loss and return loss.

What layer counts do you support for standard production?

We commonly build 4–16 layer PCBs for automotive and industrial applications, and up to 30–40 layers for telecom, server and special projects. Higher layer counts can be evaluated based on design and reliability requirements.

Can you help optimize my existing stack-up for better cost or performance?

Yes. Our engineers can review your current stack-up, materials and impedance requirements, then propose alternatives that reduce cost, improve SI/PI, or enhance manufacturability.

How do you control impedance on multilayer PCBs?

We design the stack-up using known dielectric constants and thicknesses, run field-solver calculations, add impedance coupons on each panel and verify them via TDR to meet the specified tolerance.

What documents should I provide for a multilayer PCB quotation?

Please provide Gerber/ODB++ data, stack-up or layer count, board thickness, copper weight, surface finish, impedance requirements, target quantity and any relevant standards (e.g. IATF 16949, IPC Class 3).

Can you also assemble my multilayer PCBs into finished boards?

Yes. Rich Full Joy offers full PCBA services, including component sourcing, SMT/THT assembly, functional testing and even box-build, so you can move from bare board to complete electronics with one partner.

From what current level should I consider a heavy copper PCB?

When required currents (continuous or surge) lead to unacceptable temperature rise with standard copper thickness, or when mechanical and thermal robustness at connection points becomes critical, heavy copper should be evaluated. This often starts in the tens of amps and above, depending on geometry and cooling.

What copper thickness can you support?

We support a range from 2 oz upward, with higher values available on selected layers subject to stackup and manufacturability review. Exact limits depend on board size, layer count and design details.

How do I estimate the required copper width for my current?

Share your current, allowable temperature rise, ambient conditions and cooling concept, and we can provide sizing guidance and design rules tailored to your application.

Does heavy copper always increase cost significantly?

Heavy copper does increase material and process costs, but it can reduce total system cost by eliminating separate busbars, cables or additional mechanical parts. We can help you evaluate the trade-offs.