RF PCB Stackup Planning

Start from the reference structure

Use the stackup library to sketch the signal layers, planes and dielectric regions. Mark the reference for each critical route before choosing a convenient layer count. The educational concepts help expose decisions, but the proposed board still needs a manufacturing review. Keep electrical intent and mechanical thickness requirements on the same drawing.

Define core and bonding regions separately

A core designation does not identify every region in a multilayer board. Record the proposed bonding material and pressed separation as well as the core thickness and copper. The multilayer RF guide provides the broader construction context. Ask the fabricator to identify provisional items so the electrical model can be updated before the build is approved.

Choose a hybrid build for an explicit reason

Follow hybrid stackup PCB when RF and support functions may use different materials. State which layers require the selected RF construction and what the other layers do. Compare the full proposal, including bonding and interconnects. A smaller allocation of RF material is only one commercial input and does not alone establish a better finished-board choice.

Connect impedance geometry to manufacturing inputs

Use controlled-impedance PCB to describe target geometry and acceptance. The relevant dielectric thickness is the region seen by the line, not automatically the total board thickness. Specify foil, finished copper and finish where they matter. Preserve the model assumptions so a proposed material or pressed-thickness change can be assessed against the same RF requirement.

Review via structures and processing sequence

Choose the HDI RF guide for microvia and dense interconnect questions, and cavity and back-drill review for the corresponding features. Show which layers a hole connects and any remaining stub or access requirement. A named technology does not define acceptable geometry; provide the actual construction and request a reviewed proposal.

Include thermal and mechanical constraints

A stackup also has to fit the assembly. Document connector engagement, mounting, flatness needs and the path for dissipated heat where relevant. The copper and thermal construction guide helps frame those questions. Keep them visible while layers are being selected, because an electrical change may also affect the physical arrangement or attachment details.

Select evidence that represents the layer pair

The test-report guide helps define coupons and measurement scope. Check that a proposed test structure represents the critical layer pair, copper and finish. A straight line may not represent a layer transition or compact resonator. Record which questions the sample answers and which remain for assembled-product testing or a separate qualification activity.

Release the layer drawing with change rules

Use the DFM checklist to identify missing details before requesting a construction review. Retain the approved material designations, thickness basis, copper and bonding proposal with the drawing revision. Define which changes require engineering approval. This prevents a later sourcing or processing proposal from silently replacing the stackup used for the original RF evidence.

Prepare a reviewable engineering request

Check only the requirements you have actually documented. This list records readiness; it does not inspect your files or certify a design. Missing information is useful: identify it explicitly so the engineering review can resolve it before a production release.

These inputs are processed in your browser and are not submitted by this tool. The downloaded summary is a plain-text planning record. Use the secure quote form to send files; request an NDA first if your project requires one.

Manufacturing context

RFPCB and PCBSync share the manufacturing facility shown below. These process photographs illustrate the production environment; they are not evidence that a particular board, material grade or RF performance has been qualified. Request the documentation and inspection scope applicable to your project.

RF stackup planning questions