PCB Antenna Design for 1090 MHz

flux

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
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