PCB Antenna Design for 1090 MHz
Thought for 3 sec
Use this as the PCB antenna geometry for 1090 MHz ADS-B:
- Type: edge-fed quarter-wave PCB monopole
- Target electrical length: ~68.8 mm in free space
- Practical PCB trace starting length: 63–66 mm
- Trace width: match your PCB’s 50 Ω feed; for common 1.6 mm FR-4, start around 3.0 mm wide microstrip over solid ground
- Antenna section: straight trace extending from the SMA center pin at the board edge
- Ground: solid ground plane behind/around the SMA, but no ground copper under the radiating antenna trace
- Keepout: at least 5–10 mm clearance around the antenna trace from copper, components, vias, and board edges except the feed edge
- Tuning: make the antenna trace slightly long, around 66–68 mm, then trim shorter during VNA tuning
Recommended layout:
Text
SMA edge connector │ center pin │ ├── 50 Ω feed trace, short │ └═══════════════════════════════════════ 63–66 mm PCB monopole antenna trace Ground plane only near SMA/feed. No ground underneath the antenna trace.
If board space allows, make it a straight 65 mm trace. If not, meander it, but expect lower efficiency and more tuning sensitivity.
Create layout guide
Calculate board dimensions
Explain keepout
Check antenna feed
Meandered version
To get started, talk to Flux or create a New Document.
Welcome 👋
Flux helps you build PCBs faster with an AI teammate!
Create your account to collaborate, stay updated, fork your own version, and get instant answers from our AI agent.