Overview
How to choose and place decoupling capacitors for RF modules, transmitters and receivers.
Design checklist
- Place capacitors close to RF IC power pins.
- Use multiple capacitor values for broadband decoupling.
- Minimize loop area between capacitor, IC pin and ground.
- Use a solid ground plane and short vias.
Practical notes
RF layout is sensitive to trace geometry, return current, grounding, enclosure materials and nearby components. Always compare your layout with the RF module or antenna manufacturer reference design.
Common mistakes
Common mistakes include routing under antennas, broken ground return paths, long matching network traces, poor connector grounding and tuning before the final enclosure is built.